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【单选题】
关于假设检验，以下错误的一项是A.
配对设计的t检验不需要方差齐条件
B.
设计的两样本均数比较，需要先进行方差齐检验
C.
配对设计的t检验，每一对中2个个体相互独立
D.
配对设计的t检验，每一对中2个个体不同的处理是随机分配的
E.
对于既能用设计检验也能用配对设计检验的资料，后者的检验效率要高于前者
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举一反三
【简答题】若AX=3500H,CX=56B8H,当AND AX,CX指令执行后,AX=() A1400H B77F8H C0000H D0FFFFH
【单选题】It is said that the agreement ______ between the two companies last month will become effective from May 1st.
A.
to sign
B.
signed
C.
to be signed
D.
signing
【单选题】The lecture is so attractive that the audience are listening_________.
A.
attentively
B.
anxiously
C.
effectively
D.
absolutely
【单选题】The main topic of the passage is ______.
A.
laughter and physical exercise have similar effects on the human body
B.
smile can produce the same effects as laughter
C.
pain can be reduced by laughter
D.
laughter is the best medicine
【简答题】有效的,生效的 effe_______ adj.
【单选题】Advertising is often the most _______ method of promotion.
A.
efficient
B.
efficiency
C.
effect
D.
effective
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