无线通信导频单工方式下,在150MHZ频段,收发频率间隔一般为()
A.5.7M
B.10M
C.45M
参考答案:A
—Did you have a good trip?
—Yes. The light rain didn't stop us _______ the trip. [ ]
A. to enjoy
B. enjoy
C. from enjoying
D. in enjoying
确定压力容器是否属于《压力容器安全技术监察规程》管辖范围的压力条件指的是()
A.设计压力
B.最高工作压力
C.最大允许工作压力