关于胶体和溶液的本质区别，下列叙述中正确的（ ） A．溶液呈电中性，胶体带电荷

5 When and where to go _____

A have not decided B have not been decided C has not decided D has not been decided

下列具有受体酪氨酸蛋白激酶活性的是（　　）

A．甲状腺素受体

B．雌激素受体

C．乙酰胆碱受体

D．表皮生长因子受体

E．肾上腺素受体

根据括号中所给的汉语写出英文单词，使句子意思完整正确。

小题1:Nowadays, few young people want to buy _________(收音机). They can use their mobile phones to listen to music.

小题2:The hall was         (拥挤的) because many students and their parents came to attend the farewell party.

小题3:I live on the        (第二十一) floor of a tall building in the centre of the city.

小题4:They kept working in the field though it rained ___________ (猛烈地).

小题5:My family has _______(计划) to go on a trip to Hainan this summer vacation.

小题6:The reporters gathered around at once in order to interview the             (幸存者) relatives.

在螺纹代号标准中，（）螺纹可省加注旋向。

A、左旋

B、右旋

C、左右旋均行

D、左右旋均不行

横向斜撑设置有如下规定（）。

A.一字型、开口型双排脚手架的两端必须设置

B.高度24m以上的封圈型双排架除在拐角处设置外，中间应每隔6跨设置一道

C.高度在24m以上的封圈型双排架可不设置

D.高度在24m以上的封圈型双排架应在拐角处设置

E.20m高度以下的封圈型双排架须在拐角处设置