WJ-7型扣件的铁垫板下调高垫板根据厚度不同，分为（）两种规格。
A.2mm
B.3mm
C.5mm
D.10mm
参考答案：C, D
—May I listen to MP3 here, Mr. Wang?
—Sorry. You'd better ______ it like that. [ ]
A. Not to do
B. not do
C. Don't do
D. not do to
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