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【简答题】
在光线作用下电子逸出物体表面发射称（）效应；入射光强改变物质导电率的现象称（）效应；半导体材料吸收光能后在PN结上产生电动式的效应称（）效应。
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皮皮学刷刷变学霸
举一反三
【单选题】What is learned about the bank?
A.
It has opened a new branch office.
B.
It is the largest bank in the city.
C.
It is lowering its fees on certain products.
D.
It has been in business for more than 100 years.
【单选题】将进货单价为40元的商品按50元出售时，售出500个，经市场调查发现：该商品每涨价1元，其销量减少10个，为了赚8000元，则售价应定为（ ）
A.
60元
B.
80元
C.
60元或80元
D.
70元
【简答题】将进货单价为40元的商品按50元售出时，能卖出500个，已知这种商品每涨价0.1元时，其销量就减少1个，问：为了赚得9000元的利润，售价应定为多少？这时应进货多少个？
【单选题】Pasion, a slave worked for two leading Athenian bands, later opened a bank of his own.
A.
Y
B.
N
C.
NG
【简答题】将进货单价为40元的商品按50元售出时，就能卖出500个．已知这种商品每个涨价1元，其销售量就减少10个．为了赚得8000元的利润，每个商品售价应定为多少元？这时应进货多少个？
【单选题】How long will it take you to get the bank card if you have opened an account in a hank?
A.
Two weeks after you opened the account.
B.
At least one week after you opened the account.
C.
Less than a week after you opened the account.
D.
Immediately after you opened die account.
【简答题】将进货单价为40元的商品按50元出售时，能卖出500个．已知这种商品每个涨价1元，其销售量就减少10个，则为了赚得8000元的利润售价应定为______元．
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