压力表常见的故障有:()、()、()、指示不正确
参考答案:指针抖动;指针不动;指针不回零
The man gets angry easily. Nobody except his wife and son can _____ him down when he does. [ ]
A. turn
B. calm
C. hold
D. lie
黄土经冲刷、搬运、沉积等地质作用形成的夹有砂、砾石并具层理的黄色土状沉积物称为()。