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【单选题】
甘草酸的性质不包括:A.
能被中性乙酸铅沉淀
B.
盐
C.
易溶于热冰乙酸中
D.
易溶于氨水
E.
易被酸水解
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【简答题】由甲地去丙地必须经过乙地,甲地到乙地有3条道路,乙地到丙地有2条道路,那么由甲地经过乙地到丙地有多少种不同的走法?
【简答题】We request you cover a warehouse ______ warehouse insurance for 500000 Yuan ______ large electronic computers ______ transit from our warehouse to New York port.
【简答题】由甲地去丙地必须经过乙地,甲地到乙地有三条道路,乙地到丙地有两条道路,那么甲地经过乙地到丙地,共有多少种不同的走法____。
【单选题】Electronic animals are very popular in China's large cities because ______.
A.
it is small in size and easy to take care of
B.
it can eat and feel like real animals
C.
it can in a way satisfy animal lovers
D.
it is invented in Japan
【单选题】The first electronic computer in 1945 was so bulky that it filled a large room and weighed 30 tons.
A.
large and heavy
B.
complicated and rough
C.
powerful and strong
D.
heavy and powerful
【单选题】The world's first large electronic computer (1946) ______.
A.
was built after the World War Ⅱ
B.
was used for over 10 years
C.
contained 25000 valves
D.
could perform only 10000 calculations per second
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