皮皮学，免费搜题
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搜题
【单选题】
用马血清制备的抗毒素的缺点是A.
制备较困难
B.
纯度不高
C.
产量低
D.
可产生变态反应
E.
不易保存
拍照语音搜题，微信中搜索"皮皮学"使用
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皮皮学刷刷变学霸
举一反三
【单选题】While introducing your work, you can say ( ).
A.
I work in fiance department.
B.
I work in a finance department.
C.
I work for finance department.
D.
I work for a finance department.
【单选题】An Englishman uses 'I' to refer to himself, while a German uses 'ich', a Spaniard 'yo'. This is an example of language ______.
A.
duality
B.
displacement
C.
transmission
D.
arbitrariness
【单选题】An Englishman uses 'I' to re{er to himself, while a German uses 'ich', a Spaniard 'yo'. This is an example of language ______.
A.
duality
B.
displacement
C.
transmission
D.
arbitrariness
【简答题】While introducing her company, Ms. Smith takes out a blue brochure.
【简答题】已知点M为抛物线y 2 =4x上一点，若点M到直线l 1 ：x=-1的距离为d 1 ，点M到直线l 2 ：3x-4y+12=0的距离为d 2 ，则d 1 +d 2 的最小值为______．
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