查询词典 F

In particular, if a mapping F is sublower semicontinuous then F is necessarily almost lower semicontinuous, but the inverse implication is false .

特别地，文中证明了：一个几乎下半连续映射F不必是次下半连续的，但是，次下半连续映射必定是几乎下半连续的。

Based on the analysis of dip angle, friction coefficient between rigid bodies, influence effect of floor sliding block and roof fracture rock-mass, working resistance of support as well as compound characteristics of face surrounding rock, main factors which lead to destabilize in system "R-S-F" were obtained, and the controlling pattern of dynamic stability of firming bedding, controlling keys, achieving the goal were also established.

通过对工作面围岩组成特征、支架工作阻力、顶板破断岩块及底板破坏滑移体影响效应、刚体之间的摩擦因数以及煤层倾角等因素的分析，给出了引发"R-S-F"系统失稳的主导参数，确定了"稳固基础，控制关键，达到目的"的"R-S-F"系统动态稳定性控制模式和现场生产管理过程中需注意和解决的关键技术问题。

Let Mn be the linear space of all n × n matrices over F,and let Sn be its subspace consisting of all symmetric matrices.

Mn记F上所有n阶矩阵构成的线性空间，Sn记F上所有n阶对称矩阵构成的线性空间。

We denote by M_n and T_n the space of n×n full matrices and the space of n×n upper trangular matrices over F, respectively.

设F是域。记M_n和T_n分别为域F上n×n全矩阵空间和n×n上三角矩阵空间。

Show that f is strictly increasing and find the domain of the inverse function g.

设有f=x^4 +2 x^2 +1，x在[0， 2]中，证明f严格递增，找出反函数的定义域并写出反函数的表达式

A Riemann sum with uniform interval size d and f evaluated at the maximum point of f in each subinterval.

在等区间大小d下，f在每一区间中取极大值点所对应的点所得的黎曼和。

A Riemann sum with uniform interval size d and f evaluated at the minimum point of f in each subinterval.

在等区间大小d下，f在每一区间中取极小值点所对应的点所得的黎曼和。

The derivative of a function can be interpreted either as a function whose value at x is equal to the gradient of the tangent line to the graph of y=f at x, or, alternatively, as a function that describes the instantaneous rate of change of y with respect to x at the point x.

一个函数的导数可以理解为一个函数的值无论是在x是等于切线的梯度的y图二F在x，或者，或者，作为一个函数描述瞬时速度y的变化的关于x的点x在f关于x的也可以表示为导数

Result: A lot of hair cuticles scale off and microfilament fuse and disappear in F group; some hair cuticles scale off and microfilament lined turbidly; the morphological changing in B group are situated between the F and Z group.

结果：发现F组毛小皮大部分脱落，皮质中微丝束融合或消失；Z组毛小皮少部分脱落，皮质中微丝束排列略紊乱，而B组的改变介于前两者之间。

F FAHRENHEIT, The unit of temperature measurement in which 32 indicates the freezing point of water and 212 indicates the boiling point.

华氏度，温度的度量单位。32°F表示水的冰点，212°F表示水的沸点。

Breath, muscle contraction of the buttocks; arch body, as far as possible to hold his head, right leg straight towards the ceiling (peg-leg knee in order to avoid muscle tension).

呼气，收缩臀部肌肉；拱起身体，尽量抬起头来，右腿伸直朝向天花板（膝微屈，以避免肌肉紧张）。

The cost of moving grain food products was unchanged from May, but year over year are up 8%.

粮食产品的运输费用与5月份相比没有变化，但却比去年同期高8％。