自动喷淋头在多少温度便会自动爆开？
参考答案：
50~70℃
— Welcome to ______ school.
— Thanks. Your school is very nice.
A．his
B．your
C．their
D．our
在倾角超过25°的巷道中装车时，煤矸不得超过车上沿。
