皮皮学，免费搜题
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【单选题】
当水流流经水轮机时,其主要损失为A.
机械能
B.
热能
C.
漏水和摩擦等
D.
以上均不是
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知识点：
皮皮学刷刷变学霸
举一反三
【单选题】When navigating in thick fog with the radar on，you should（）.
A.
station the look-out in the wheelhouse to keep a continuous watch on the radar
B.
secure the sounding of fog signals until a vessel closes within five miles
C.
station a look-out as low down and far forward as possible
D.
keep the radar on the shortest available range for early detection of approaching vessels
【单选题】The radar warning systems can
A.
tell drivers accidents on the road in advance.
B.
remind drivers when there is only a little oil left.
C.
help drivers change the direction.
D.
give alarm signals if drivers get too close to other cars.
【单选题】When approaching a fog bank or rain squall, _______ should always be switched on.
A.
VHF
B.
radar
C.
warning signals
D.
red lights
【单选题】In line l0．when the author states that the owners“anxiously watch the sky”，there is the implication that the owners__________ ．
A.
want their pigeons to win the race
B.
are sending radar signals to their pigeons
C.
do not know whether the race began on time
D.
do not trust the rules set down by the judges
【单选题】人们购买化妆品,并不是为了获得它的某些化学成分,而是要获得“美”这个角度来说,化妆品所提供的“美化”功能属于
A.
潜在产品层
B.
附加产品层
C.
形式产品层
D.
球心产品层
【多选题】影响品德发展的社会因素包括：
A.
社会精神文化对品德发展具有重要的直接的作用
B.
生产方式对品德发展起根本性影响作用
C.
家庭和邻里社区对品德发展具有重要作用
D.
学校德育在品德发展中起主导作用
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