听力原文:M: Have you a table for four?
W: Certainly, sir. A comer table.
What is the man doing?
A.Looking for a timetable.
B.Buying some furniture.
C.Reserving a table.
D.Window shopping.
第6题
通常所说的VVVF电梯是指______。
A.交流双速电梯
B.直流电梯
C.交流调压调速电梯
D.交流调频调速电梯
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