A.Children begin to work from an earlier age than before.
B.Many students follow a formal vocational program.
C.It is not so expensive to train professionals.
D.There are not enough training places for workers.
第5题
自动洗片机显影温度的设定范围正确的是()
A、18℃~22℃
B、18℃~20℃
C、33℃~35℃
D、40℃~45℃
E、18℃~30℃
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