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搜题
【单选题】
某医生随机抽取100名儿童,检查粪便蛔虫卵阳性情况,得阳性率为20%,则此阳性率的标准误Sp为A.
4％
B.
0.4％
C.
0.04％
D.
1.6％
E.
0.2％
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举一反三
【单选题】Thousands of______at the stadium came to their feet to pay tribute to an outstanding performance.
A.
audience
B.
participants
C.
spectators
D.
observers
【单选题】I must say, it’s a very offer. The pay is higher and the working conditions are much better.
A.
attractive
B.
wealthy
C.
valuable
D.
worth
【单选题】（ ）iS a property of object—oriented software by which an abstract operation ma)’be performed in different ways in different classes．
A.
Method
B.
Polymorphism
C.
Inheritance
D.
Encapsulation
【多选题】From the logistical system viewpoint, some factors are fundamental to transportation performance, they are ( )
A.
speed
B.
cost
C.
consistency
D.
distance
【简答题】The [Ag + ] of a solution is 4.0×10 -5 . Calculate the [Cl - ] that must be exceeded before AgCl can precipitate.
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