低合金钢所含合金元素总量是________。

如图所示任意截面的变形，N-A为中性轴，为形心相对于中性轴的挠度，为曲率半径，则下列关系式正确的是()。

A、

B、

C、

D、

A、I级

B、II级

C、III级

D、IV级

A、过程取向

B、强调行政的目的性

C、强调行政的组织理性

D、忽视了行政的主体特性

From Something Not Food, there are phrases like “throw a desperate look at her”, “sleepless nights”, “lurking papers”, and “looming finals”. They are examples of a figure of speech in which a modifier is transferred from the appropriate noun to modify another to which it does not really belong, such as: “the condemned cell”, “a happy day”. Please choose an appropriate adjective to fill in the following blank. He, wondering what was suitable for him.

A、raised an enquring eyebrow

B、raised a happy eyebrow

C、raised a smiling eyebrow

D、raised an angry eyebrow

按本章的定义，如图所示的弯矩M符号为正。

A、屏障要求

B、预防为主

C、实用原则

D、物理屏障严格的实验室对个人防护的要求可以降低