机房要求保持干燥,机房湿度H在()范围内,并且配有湿度计和湿度调节设备(如空调、抽湿机)。
A.15~85%
B.50%~80%
C.15%~80%
D.10%~85%
参考答案:C
It was with the help of the local guide ________ the mountain climber was rescued.
(2013·重庆,27)
A.who
B.that
C.when
D.how
心室充盈过程中的主要阶段是
A.心房收缩期
B.等容收缩期
C.等容舒张期
D.快速充盈期
E.快速射血期