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【简答题】
在铰链四杆机构中,已知各杆长度分别为 L AB =75mm , L BC =50mm , L CD =100mm , L AD =120mm 。试问:( 1 )当取构件 AB 为机架时,该机构是否存在曲柄?如果存在,请指出它是哪一构件?为什么? ( 2 )当取构件 BC 为机架时,又会得到什么机构?为什么?
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反馈参考答案：
举一反三
【单选题】The fact that audiences are egocentric means that
A.
listeners interpret what you say on the basis of what they know and believe
B.
listeners believe that their cultural group is superior to all other groups
C.
listeners interpret the speech through the speaker’s frame of reference
D.
all of the above
E.
a and c only
【单选题】According to the text, Lord Norwich is probably
A.
an egocentric man.
B.
a conservative.
C.
a modest scholar.
D.
a nobleman.
【判断题】One genetic codon only encodes for one amino acid, and each amino acid is specified by one codon.
A.
正确
B.
错误
【单选题】[Single-choice question] In protein synthesis, to translate each genetic codon on mRNA into each amino acid in proteins. Each genetic codon is a set of____continuous nucleotides on mRNA.
A.
one
B.
two
C.
three
D.
four
【简答题】Chinese selves are less egocentric but more ______________.
【简答题】净现值指的是投资项目所引起的未来的现金流入的现值与现金流出的现值的之()
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