在什么情况下需要对硬件设备执行“返回驱动程序”的操作？能否对打印机驱动程序执行这种操

Living with a host family while studying abroad, in which there may be some other college students, __________ you the chance to learn more about the new culture.

A．give

B．gives

C．giving

D．to give

对于尿量已减少的中毒性休克患者最好选用（）

A、异丙肾上腺素

B、多巴胺

C、去甲肾上腺素

D、肾上腺素

E、麻黄碱

A survival craft being used to pick up a person who has fallen overboard from a vessel ahould approach the person（）.

A.at a high rate of speed

B.under oars

C.against the wind

D.with the wind

精神发育迟滞属于( )。

A．记忆障碍

B．注意障碍

C．智能障碍

D．思维障碍

水封的有效高度为煤气计算压力至少加（）毫米水柱？

A.400

B.500

C.600

D.700