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【多选题】
在下列平面四杆机构中,( )不存在死点位置。A.
双曲柄机构；
B.
对心曲柄滑块机构；
C.
曲柄摇杆机构；
D.
转动导杆机构。
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举一反三
【单选题】Foreman Company’s revenues are $300 on investedcapital of $240. Expenses are currently84% of sales. If Foreman Company canreduce its expenses to 75% of sales, return on investment will be:
A.
20%
B.
31.25%
C.
93.75%
D.
None of these answers is correct.
【单选题】If Stephanie buys a laptop for $700 and the maximum she would have paid was $1,000, which of the following is true?
A.
Stephanie received consumer surplus of $1,000.
B.
Stephanie received producer surplus of $700.
C.
Stephanie received a consumer surplus of $700.
D.
Stephanie received a consumer surplus of $300.
【单选题】沿海喜食海产品的地区发生的细菌性食物中毒以下列哪项较为多见（ ）。
A.
沙门菌食物中毒
B.
肉毒杆菌食物中毒
C.
致病大肠杆菌中毒
D.
副溶血性弧菌
E.
葡萄球菌中毒
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