救生抛投器的动力源为()。
A.高压空气
B.高压氮气
C.电力
D.弹簧
参考答案:A
Mike ______ English well. ______ your friend speak English, too?[ ]
A. speak, Does
B. speaks, Do
C. speaks, Does
食管反流饮食治疗以稀薄饮食为主,少量多餐。()