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【单选题】
以下哪一种疾病最容易发生夜间阵发性呼吸困难()。A.
. 房间隔缺损
B.
. 原发性高血压
C.
. 肺源性心脏病
D.
. 肺动脉瓣狭窄
E.
. 慢性缩窄性心包炎
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【单选题】某企业权益和负债资金的比例为6：4，债务资本成本为7％，股东权益资本成本是15％，所得税税率为25％，则平均资本成本为( )。
A.
11．8％
B.
13％
C.
8．4
D.
11％
【单选题】Senility refers to great losses of intellectual capacity that occurs in old age and is associated with the widespread loss of nerve cells and the shrinkage of brain tissue. Senility is a great decline...
A.
level
B.
extent
C.
scope
D.
criterion
【简答题】A．All professional athletes. B．All stars. C．A few stars. D．International tennis stars.
【单选题】The national flag of the United States is called 'the Stars and Stripes', with______ stars and______horizontal stripes on it.
A.
51, 12
B.
50, 13
C.
51, 15
D.
50, 12
【单选题】某企业权益和负债资金的比例为6：4，债务资本成本为7％，股东权益资本成本为15％，所得税税率为25％，则平均资本成本为( )。
A.
ll．8％
B.
13％
C.
8．4％
D.
11％
【单选题】设计数器直接测周的分辨力为1ms，若采用多周期测量法，欲将测周分辨力提高到0.1μs，应选择的“周期倍乘”为（）共同构成的平面域。
A.
10
B.
10-4
C.
10-1
D.
104
【单选题】The 50 stars in the national flag of America represent 50 .
A.
cities
B.
famous presidents
C.
states
D.
senate members
【单选题】The 50 stars on the Americas national flag represent its 50
A.
current states.
B.
nations.
C.
colonial states.
D.
cities.
【多选题】Why does the American flag have 50 stars?
A.
Because there is one star for each state
B.
Because there are 50 cities in America
C.
Because each star represents a state
D.
Because there are 50 states in America
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