【单选题】关于锅炉性能=参数的以下说法正确的是 。
A.
使用时工作压力绝对不许超过标示的名义工作压力
【单选题】(Only then)(he became) aware of (the fact) that there were more difficulties ahead (than) he had expected.
【单选题】(Only then) he (became) aware of (the fact) that there were more difficulties ahead (than) he had expected.
【简答题】He only then became aware (意识到) of the ers of the jungle. (Only then...)
【单选题】Prof Flynn found no students in the lecture hall when he arrived. Only then did he realize that he came ______ early.