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【单选题】
一个蛋白质分子含有二硫键，所以该蛋白质中有( )。A.
甲硫氨酸
B.
赖氨酸
C.
半胱氨酸
D.
色氨酸
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反馈参考答案：
举一反三
【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
【判断题】U CC 是放大电路的直流电源,一方面与R B ,R C 相配合,使晶体管的发射结正偏、集电结反偏,以满足晶体管放大的外部条件;另一方面为输出信号提供能量。 U CC 的数值一般为几~十几伏。
A.
正确
B.
错误
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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