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【单选题】
____ are increasingly used as main engine on merchant vessels, because they have a high Hp/Weight ratio.A.
Slow speed diesel engines
B.
Medium-speed diesel engines
C.
Steam engines
D.
Gasoline engines
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【单选题】设函数【图片】在点【图片】处的两个偏导数存在，则【图片】是【图片】在点【图片】处取得极值的（ ）
A.
充分但非必要条件
B.
必要但非充分条件
C.
充分必要条件
D.
既不是必要，也不是充分条件
【单选题】—What do you usually do on Sunday? —I usually volunteer at an animal hospital the animals.
A.
take risks
B.
to take risks
C.
look after
D.
to look after
【单选题】He asked what I ____that poor animal.
A.
agreed with
B.
did with
C.
called on
D.
took care
【简答题】设函数【图片】,则【图片】在点【图片】的值为
【单选题】—What does this modern-day dinosaur look like? —The tongue of this animal can be extended _____ of its body.
A.
more than twice the length
B.
twice more than the length
C.
more than the length twice
D.
more twice than the length
【简答题】What kind of animal is the coyote described as?
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