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【单选题】
根据中华人民共和国标准化法规定,我国标准分为()A.
两级。
B.
三级。
C.
四级。
D.
五级。
E.
六级。
拍照语音搜题，微信中搜索"皮皮学"使用
参考答案：
参考解析：
知识点：
皮皮学刷刷变学霸
举一反三
【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
B.
锅炉受热面积即锅炉水被加热产生的蒸汽的面积
C.
蒸发率越高则效率越高
D.
炉膛溶剂热负荷则炉膛内工作温度高
【单选题】(Only then) he (became) aware of (the fact) that there were more difficulties ahead (than) he had expected.
A.
Only then
B.
became
C.
the fact
D.
than
【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.
A.
too much
B.
much too
C.
so much
D.
much so
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