矿井通风安全监测装置每隔()天进行一次调试。
参考答案:7~10
Motivation is the driving force within individuals that impels them to action.
A.impedes
B.interferes
C.holds
D.pushes
GPS接收器的工作电压是()。
A.5V
B.12V
C.6V
D.24V