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【单选题】
在玻璃 ( 折射率 n 3 1.60) 表面镀一层 MgF 2 ( 折射率 n 2 = 1.38) 薄膜作为增透膜。为了使波长为 500 nm(1nm=10 9 m) 的光从空气 ( n 1 = 1.00) 正入射时尽可能少反射, MgF 2 薄膜的最少厚度应是 ( )A.
78.1 nm
B.
90.6 nm
C.
125 nm
D.
181 nm
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举一反三
【单选题】If a company buys inventory on account:
A.
cash would decrease.
B.
accounts payable would increase.
C.
net income would increase.
D.
common Stock would decrease.
【简答题】buys the materials needed by the company.A. Purchasing
【多选题】Company A buys glue for use in manufacturing its products from companies B, C and D. Which of the following are unlikely to decrease the amount of glue that Company A demands?
A.
Company B begins selling glue to consumers.
B.
Company C increases its glue prices.
C.
Company D stops producing glue.
D.
Company E begins buying glue from companies B, C and D.
【单选题】For each pair of shoes a customer buys, the company ___________.
A.
gives away money
B.
gives a pair away
C.
invests a dollar in a local business
【单选题】In the US, a person/'s company buys him or her health insurance
A.
Right
B.
Wrong
C.
Not mentioned
【单选题】In the US a pemon’S company buys him or her health insurance．
A.
Right
B.
Wrong
C.
Not mentioned
【简答题】壁虎能在墙上活动自如是因为壁虎“脚”底大量的细毛与（）之间产生的“范德瓦尔斯力”累积而成的。“范德瓦尔斯力”是中性分子彼此距离非常近时，产生的一种微弱电磁引力。
【简答题】__________buys goods for the company.
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