阀门定位器的输入气源压力为3～15psi，则其输出气源压力为（）。

搜题请搜索小程序“爱下问搜题”

问题单项选择题

A、3～15psi

B、0～3psi

C、0～15psi

D、6～30psi

答案

参考答案：D

填空题

动词填空。

1. All of the boys must______ (be) here before seven o'clock?

2. Life______ (be) a good teacher.It has taught me how ______ (think)

3.—Who ______ (knock) at the door?

—I ______ (not know).Let me go and see.

4. I'm glad ______ (hear) that you ______ (pass) the exam already.

5.Would you like something ______ (eat)?

问答题简答题

从事国际航线航行的船舶进口申报时需向我国港务监督机构提交哪些单证？