According to the passage, which of the following is a necessity? ()
A.Shortened opera performances.
B.Quickened paces of movies.
C.Speeded-up work efficiency.
D.Working on holidays.
第2题
蒸汽锅炉正常运行时要做()调节工作。 A.水位、汽压 B.汽温.风量 C.燃烧、吹灰 D.排污
A.ABD
B.ACD
C.ABC
D.ABCD
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