复杂断面的型钢有（）、槽钢和钢轨等。

从方框中选出适当的句子，完成对话，有两项为多余选项。

A：Hello, Charles.

B：Hello, Claire. Nice to see you here. How are you?

A：Fine, thanks, Where are you going for your summer holidays, Charles?

B：小题1:      I’m going to stay with my uncle for three weeks.

A：You certainly are lucky. How are you going there?

B：By air, of course. 小题2:       

A：I’m going to visit my grandparents in a small village. I go there every summer.

B：Sounds great! I’ve never been to the countryside. What do you do there?

A：I do many things. 小题3:       

B：It’s fantastic! Are you going there alone?

A：No. 小题4:      By the way, what’s John going to do this summer?

B：He says he’s going to the mountains with his parents. Well, I’ve got to go. Have fun, Charles.

A：小题5:       I’ll see you in September.

清朝前期大兴文字狱，知识分子写作诗词文章，稍有不慎，就会招来杀身之祸，下列清朝的诗句中，只有________可能不会招来杀身之祸。[ ]

A．明月有情还顾我，清风无意不留人

B．一把心肠论浊清

C．清风不识字，何故乱翻书

D．绿叶清阴看总好

如图所示，圆柱形容器中装有质量相等的水和酒精（ρ_水>ρ_酒精），这时容器底部受到液体的压强为p₁。把水和酒精充分混合后（不考虑水和酒精的蒸发），容器底部受到液体的压强为p₂。则

A．p₁>p₂

B．p₁<p₂

C．p₁＝p₂

D．无法确定

因静脉痉挛引起输液不滴应（）

A．另找血管重新穿刺

B．调节针头位置

C．更换针头重新穿刺

D．抬高输液瓶位置

E．热敷注射部位