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【判断题】
双作用式叶片泵转子每转一,每个密封容积完成两次吸油和两次压油。A.
正确
B.
错误
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反馈参考答案：
举一反三
【单选题】下列关于元素周期表的说法正确的是( )
A.
元素周期表短周期中有6种金属元素
B.
元素周期表中第ⅦA族有4种非金属元素
C.
元素周期表中第1、2、3周期为短周期
D.
元素周期表中第ⅠA族全部是金属元素
【单选题】I learned a little Russian _____ I was at middle school.
A.
though
B.
although
C.
as if
D.
when
【单选题】下列关于元素周期表的说法正确的是 ( )
A.
元素周期表共有 7 个周期、 18 个族
B.
38 号元素位于第五周期第 ⅡA 族
C.
非金属元素均位于元素周期表的右侧
D.
第六周期共有 18 种元素
【单选题】The Russian crisis of 1998
A.
occurred because of the inability of the Russian Government to lower the taxes.
B.
ended when President Yeltsin announced there will be no devaluation.
C.
was a culmination of continuing deterioration of economic conditions.
D.
was a result of a sharp price increase of Russian export commodities.
【单选题】I learned a little Russian _____ I was at middle school. [ ]
A.
though
B.
although
C.
if
D.
when
【单选题】We were told that ______ when Marx was already _______, he started to learn Russian.
A.
in 1840’s; in his fifties
B.
in the 1840’s; his fifties
C.
in the 1840’s; in his fifties
D.
the 1840’s; in his fifties
相关题目：
【单选题】I learned a little Russian _____ I was at middle school.
A.
though
B.
although
C.
as if
D.
when
参考解析：
知识点：
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