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【单选题】
()汽车是指驱动能量完全由电能提供的,由电机驱动的汽车。A.
混合动力
B.
燃料电池动力
C.
新能源动力
D.
纯电动
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皮皮学刷刷变学霸
举一反三
【单选题】I know him very well. He’s sure to _____ his promise
A.
carry on
B.
carry through
C.
carry out
D.
carry off
【单选题】I know him very well because we ____________friends for ages.
A.
are
B.
were
C.
had been
D.
have been
【单选题】— This returned scientist has become one of the top experts in his field. — Yes, I know him very well. He once _____ in South America with wild animals for eight years. [ ]
A.
has worked
B.
worked
C.
had worked
D.
has been working
【单选题】将截面积相等、长度相等的铜棒和铁棒串联，两端加上电压U。已知铜的电阻率比铁的电阻率小，则：
A.
铜棒电阻小，电流大
B.
铜棒与铁棒电流相同，电压降相同
C.
二者的电流密度相同，但内部场强不同
D.
二者的I、J、E均相同
【简答题】径向滑动轴承有__、__两种结构形式。
【单选题】I know him very well, because we _______ friends for ages.
A.
have made
B.
made
C.
have been
D.
are
【单选题】I know him very well because we ______ friends for ages.
A.
are
B.
we’re
C.
has been
D.
have been
【单选题】This returned Chinese scholar has become one of the top experts in this field .—Yes , I know him very well . He in Africa with wild animals for eight years .
A.
worked
B.
has been working
C.
has worked
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