成人首次胸外电击除颤的功率为A．300J B．200J C．360J D．100J_爱下问搜题

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问题单项选择题

成人首次胸外电击除颤的功率为

A．300J

B．200J

C．360J

D．100J

E．400J

答案

参考答案：B

补全对话，情景问答

补全对话。（从方框里选择合适的句子补全对话）。

A:  Come here, Panos! Look! There's a box near the big tree.
B:  1______
A:  2______ I think there are some books.
B:  No, I think there's a football.
A:  3______
B:  Ah, there's a football and some books.
A:  Oh! 4______
B:  It's Tom's. Let's find him and give him the box.
A:  Great! 5______

A: What's in it?
B: There's a name on the box.
C: Let's go and open it.
D: Let's go.
E: I don't know.

选择题

下下列说法中正确的是( )

A．氦4核中有4个质子,2个中子

B．氦4核与氦3核不是互为同位素

C．中的质子数比中子数少6

D．中的质子数比中子数少2