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【判断题】
罐头食品出现瘪罐一般为真空度过高、装量不足或机械碰撞所导致,不影响食用。A.
正确
B.
错误
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皮皮学刷刷变学霸
举一反三
【单选题】The cars in the auto show vary ______ price from $ 100,000 ______ $ 2 million, but they have attracted many customers.
A.
in; to
B.
with; and
C.
of; with
D.
from; to
【单选题】The price of the computer is not _____ but cars are very _________.
A.
high; expensive
B.
expensive; high
C.
high;high
D.
expensive;expensive
【单选题】根据《生产安全事故报告和调查处理条例》的有关规定,除道路变通事故、火灾事故外,自事故发生之日起 ( ) 日内,事故造成的伤亡人数发生变化的,应当及时补报。
A.
15
B.
20
C.
30
D.
40
【单选题】根据《生产安全事故报告和调查处理条例》的有关规定，除道路交通事故、火灾事故外，自事故发生之日起（ ）日内，事故造成的伤亡人数发生变化的，应当及时补报。
A.
15
B.
20
C.
30
D.
40
【单选题】The price elasticity of demand for new cars is 1.2. Hence, a 10 percent price increase will
A.
decrease the quantity of new cars demanded by 1.2 percent.
B.
increase consumer expenditure on new cars by 1.2 percent.
C.
decrease the quantity of new cars demanded by 12 percent.
D.
increase consumer expenditure on new cars by 12 percent.
【单选题】All those second-hand cars are sold at before
A.
40％as lower price as
B.
40％as low a price as
C.
as 40％low price as
D.
40％lower price than
【简答题】合成末端炔烃用一般的炔化方法,产率往往较低 。 但用 _______ 与 _______ 形成的络合物再进行烃化反应,则可得到好产率的末端炔烃 。
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