According to the passage, it is TRUE that ______.
A.in the late 19th century in the United States the dividing line between adolescence and adulthood no longer existed
B.no one can marry without the permission of his parents until the age of twenty-one
C.one is considered to have reached adulthood when he has a driver's license
D.one is not free from the restrictions of child labor laws until he can join the army
第3题
载货电梯的层门门扇与门扇,门扇与门套,门扇下端与地坎的间隙最大不得大于()mm。
A.8
B.11
C.14
D.17
第5题
A.4
B.6
C.8
第6题
A.4
B.6
C.8
第7题
A.6
B.8
C.10
D.4
第8题
PLC交流双速载货电梯,轿厢门关闭后,门扇之间间隙不得大于()mm。
A.10
B.15
C.6
D.8
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