当事人在诉讼中提交的证据，在下列表述中，正确的有( )。A．书证应当提交原件 B．

GB50174-2008《电子信息系统机房设计规范》规定：电场屏蔽衰减指标大于60dB的屏蔽室，结构型式宜采用直贴式，屏蔽材料可选择（）。

A.镀锌钢板；

B.金属丝网；

C.屏蔽缆线。

喉阻塞的呼吸困难分为______度，一般情况下，出现______度以上呼吸困难时，应尽快行气管切开术。

动词填空。

1. This is a good place_________ (meet) friends.

2. They_________ (plan) to have a trip now.

3. It _________ (rain) a lot in the south in summer.

4. Please take your turn _________ (get ) on the bus.

5. He needs us _________ (help) him with his English.

6. Tom, _________  (not play ) in the street. It's dangerous.

7. It's eight o'clock now. The Whites _________ (eat) snacks while they _________ (watch) a video.

8. Pease ask Wangbing __________(call) me.

9. Thank you for_________ (invite) us to your party.

后期复苏应争取在心脏停搏多少分钟内实施（）

A.2分钟内

B.4分钟内

C.6分钟内

D.8分钟内

E.10分钟内