进入桥式门式起重机的门和司机室登上桥架的舱口门，应设置（）
A、联锁保护装置
B、防护板
C、防护罩
参考答案：A
About 300,000 people climb Mount Fuji each year, according to the Japan National Tourism Organization, ______ crowding into a brief summer climbing season.
A．most of them
B．most of whom
C．most of which
D．most of where
相同厚度的同一材料分别承受不同波长的射线照射，哪种情况下对射线的吸收较少？（）
A、承受波长短的射线照射
B、承受波长长的射线照射
C、两种情况下都一样
D、以上都不对
