六淫邪气中，具有“阻遏气机”特点的是（）A．风　 B．暑　 C．湿　 D．寒　 E．

根据对话内容，补全对话，使其完整﹑通顺。每空一词。

A: we have many rules at school.

B: (1)             do we. For example, we have to (2)             school uniforms every school day.

A: We usually do, too. We are not allowed to play soccer at school because we don't have a soccer field.

B: Oh, we are lukier than you. We have a big soccer field but we can only (3)             it in P.E.

A: Our teachers are very (4)             to us but sometimes they are strict. I think it's good for us.

B: I (5)             with you. I'll miss them when I graduate.

高张型子宫收缩功能紊乱时首选（）

A.吗啡

B.哌替啶

C.小剂量麦角新碱

D.催产素静脉点滴

E.苯巴比妥钠

PNa₄的定位液中Na⁺的含量为多少（mg/L）？

当冷凝温度为40℃时，R22单级压缩机能达到的最低蒸发温度为（）℃。

A.-19.5

B.-29.8

C.-31

D.-31

写出P-1304的开车步骤及注意事项？