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【多选题】
染发剂对人体的健康影响是多方面的，染发时需要注意：( )A.
染发过程中尽量防止染发剂直接接触皮肤
B.
自己挑选和合理搭配不同的染发剂进行染发
C.
降低染发频率，一年不得超过两次
D.
怀孕或哺乳期妇女不宜染发
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参考解析：
知识点：
皮皮学刷刷变学霸
举一反三
【单选题】关于颅内动脉瘤,下述哪项是完全正确的
A.
创伤是动脉瘤破裂的主要原因
B.
动脉瘤的破裂均有一定的诱因
C.
动脉瘤破裂出血后，应嘱病人绝对卧床
D.
颅内动脉瘤均位于Willis动脉环附近
E.
脑血管造影正常，可除外颅内动脉瘤
【单选题】Jeffrey Company wants to double production of Product X from 1,000 units to 2,000 units. The variable manufacturing cost per unit is $10. The variable nonmanufacturing cost per unit is $20. There are ...
A.
$10,000
B.
$20,000
C.
$30,000
D.
$50,000
【简答题】简述CPU的核心部件组成和功能。
【单选题】Suppose the demand for good X is given by Qdx= 23 - 7Px + 2Py + M. The price of good X is $6, the price of good Y is $9, and income is $120. Given these prices and income, how much of good X will be p...
A.
96.
B.
119.
C.
146.
D.
None of the above.
【单选题】A fall in the price of X from $12 to $8 causes an increase in the quantity of Y demanded from 900 to 1,100 units. What is the cross elasticity of demand between X and Y?
A.
0.5
B.
-0.5
C.
2
D.
-2
【简答题】碗扣式脚手架的核心部件是______，由______、______和______组成。
【单选题】Yoram's utility function is U (x; y)=2x + 5y. The price of x is $4 and the price of y is $15. Yoram has $150 a week to spend on x and y. Yoram is offered a chance to join a club of y-consumers. If he ...
A.
nothing
B.
$30 a week
C.
$50 a week
D.
$75 a week
【单选题】A competitive firm produces output using three fixed factors and one variable factor. The firm's short run production function is q=163x-2x 2 , where x is the amount of variable factor used. The price...
A.
20
B.
80
C.
19
D.
40
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