二氧化碳罐车内压力不得低于（）psi。A.185 B.190 C.195 D.200

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问题单项选择题

二氧化碳罐车内压力不得低于（）psi。

A.185

B.190

C.195

D.200

答案

参考答案：A

补全对话，情景问答

( ) 1. A: What time is it? 　　　 B: It's three o'clock. It's time for music class.	A.
( ) 2. A: What time is it? 　　　 B: It's seven o'clock. It's time for breakfast.	B.
( ) 3. A: What time is it? 　　　 B: It's nine o'clock. It's time for dinner.	C.
( ) 4. A: What time is it? 　　　 B: It's ten o'clock. It's time for P. E. class.	D.

填空题

当使用Thread t=new Thread(r)创建一个线程时，表达式：r instanceof Thread的值是【15】。