口服可用于结肠手术前准备,或局部用药的氨基糖苷类药物是()
A、链霉素
B、妥布霉素
C、奈替米星
D、新霉素
参考答案:D
When we arrived in the middle of the night, there was no food ______ as all the shops were shut.
A.left
B.available
C.remaining
D.convenient
用脉冲型电缆障碍测试仪测得障碍的波形与发射波形相同,此时障碍性质是()。
A、断线
B、混线
C、地气
D、绝缘不良