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【单选题】
用abstract定义的类 。A.
可以定义对象
B.
只能包含抽象方法
C.
可以被子类继承
D.
不能被子类继承
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举一反三
【单选题】－I’d like to help the homeless people in the earthquake. －You ________ join a volunteer group.
A.
must
B.
need
C.
can
D.
couldn’t
【单选题】Your is very useful to the homeless people. [ ]
A.
donate
B.
donation
C.
donator
D.
donated
【简答题】理想电压源与电阻 ( ) 的电路模型,称为电压源模型
【单选题】固定型阀控密封式铅酸蓄电池对浮充电压要求很严格，光宇牌6-GFM（C）系列，单体以13.38V/单体48V电池组为例，标准浮充电压是：（）
A.
54.2V
B.
54.00V
C.
55.6V
D.
52.8V
E.
53.52V
【单选题】All the donated money should be made full use _______the homeless people in Ya'an city of Sichuan province.
A.
of helping
B.
to help
C.
of to help
D.
to helping
【单选题】Having arrived at the earthquake-stricken area, we were led to ____ the homeless people lived. [ ]
A.
what
B.
in which
C.
that
D.
where
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