露天或半露天的变电所，不应设置在()场所。A．有腐蚀性气体的场所 B．挑檐为燃烧体或

阅读理解。读对话，完成下列内容。

Chen: What are you going to do after school?

Mike: I want to buy some books. Where is the bookstore?

Chen: It's next to the park. You can go by the No.9 bus. Get off at the cinema. The bookstore is on the right.

Mike: Thank you.

Chen: You're welcome.

1. 怎么才能到达书店？你来排一下顺序吧。

( ) Get on the No.9 bus.

( ) The bookstore is on the right.

( ) Get off at the cinema.

2. 判断正(√)误(×)。

( ) Mike wants to buy some books.

( ) The bookstore is far from the park.

( ) Mike goes there by bus.

( ) The bookstore is on the left.

( ) Mr Chen doesn't know how to get to the park.

下列关于船舶下行说法哪个正确（）.

A.挂高规定了船舶下行驶经弯曲河段时的航路位置

B.取矮规定了船舶下行驶经弯曲河段时的航向

C.取矮要求船舶下行驶经弯曲河段时保持船首尾线与弯道轴线的切线相平行或稍向水势高的一侧扬头

D.以上都对

以下哪种心律失常用利多卡因无效

A．室上性心动过速

B．室性期前收缩

C．心室颤动

D．心肌梗死引起的室性早搏

E．强心苷引起的室性心律失常

病原微生物刺激机体产生的免疫是（）

A.被动免疫

B.主动免疫

C.混合免疫

当气蚀现象发生时，泵体因受冲击而产生（）。

A.叶轮点蚀

B.轴承损坏

C.转速降低

D.叶轮腐蚀