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【单选题】
下列关于船舶发展的说法中,错误的是_____。A.
螺旋桨推进器是目前船用推进器发展的主要形式
B.
散货船是最早的专业化船舶
C.
船舶发展的突出特点是专业化、大型化、自动化
D.
最大船型的惊人发展,是战后油船发展的最大特点
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【简答题】电路的三种工作状态是通路、 、 。
【单选题】When John was a student, his father gave him a monthly______ towards his expenses.
A.
allowance
B.
salary
C.
wage
D.
money