题目内容

What does "This rule cuts both ways" (Line 7, Paragraph 1) mean？

A. The maintenance and inspection service provided is compulsory.
B. Prices are set by the local authority.
C. Some sweeps can't stand some customers.
D. Customers and sweeps can not satisfy one another.

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图(a)所示桁架，力法基本结构如图(b)，力法典型方程中的系数δ11为()。

A. 3.414l/(EA)
B. -4.828l/(EA)
C. 4.828l/(EA)
D. 2.0l/(EA)

有如下程序： #include ＜iostream＞ using namespace std; class B { public:

A. BBB
BBD
C. DBB
DBD

A．operatesB．worksC．startsD．goes

A. operates
B. works
C. starts
D. goes

A．forB．fromC．ofD．to

A. for
B. from
C. of
D. to