成年人体内的水份约点体重的()
A、40—50%;
B、50—60%;
C、60—70%;
D、70—80%。
参考答案:B
― It is reported that Americans eat too much protein each day.
―They eat ______as they actually need.
A.as twice much
B.much as twice
C.as much twice
D.twice as much
UV/IR探头状态显示自动组态错误表示()
A、组态有问题,重新组态
B、探头一直处于上电时间延时状态,等到探头退出延时,更换探头
C、电源失败;电源或LON接线问题;探头电子故障
D、内部电源问题,更换探头