In order to perform the monitor function, language learners have to satisfy at least three conditions :______to monitor his production, focus on form and clean knowledge of the rules of the target language.

A．enough speed

B．much information

C．sufficient material

D．sufficient time

吊装前，对卷扬机等电动设备再次试验，所有动作应灵敏可靠，在吊钩上加载设备重量的（）。

A、10%

B、20%

C、25%

D、30%