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问题:

[单选] The mechanical efficiency of an engine () because losses occur in the form of friction.

A . is always less than 100%
B . is always more than 100%
C . is always equal to 90%
D . is always less than 90%

简述乱笺的恢复原则? 列入十八出歌舞伎样板戏的剧目有()。 《不破》。 《鸣神》。 《助六》。 《关羽》。 Which vessel may show three lights in a vertical line,the top and bottom being red and the middle being white? () A vessel engaged in diving operations。 A pilot vessel。 A vessel trawling。 All of the above。 招商银行一卡通客户可通过以下()渠道来修改取款密码。 任一网点柜台。 电话银行。 网上银行(大众版和专业版)。 自助查询终端。 Which publication should you check for complete information on Puget Sound weather conditions? () Sailing Directions。 Light List。 Coast Pilot。 Chart of the area。 The mechanical efficiency of an engine () because losses occur in the form of friction.
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