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【单选题】
当相关系数r=0时，表明()。A.
现象之间完全相关
B.
相关程度较小
C.
现象之间完全相关
D.
无直线相关关系
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举一反三
【单选题】All of the following statements are the advantages of inflatables EXCEPT that______.
A.
they are much lighter than traditional modules
B.
they are less expensive to launch
C.
they can expand to larger room
D.
they can fit current rockets
【单选题】According to Fields, all of the following are the advantages of his technique EXCEPT that ______.
A.
it is environmentally friendly
B.
it is safe to the people's health
C.
it is more effective than pesticides against some insects
D.
it is cheaper than pesticides
【单选题】The advantages of hotels are all of the following EXCEPT that they______.
A.
are convenient
B.
are easy to book
C.
provide standard service
D.
offer greater options
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