皮皮学，免费搜题
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【单选题】
以下哪项是从外肢体上直接分离单细胞的方法()A.
选择1加热法
B.
选择2分离法
C.
选择3机械法
D.
选择4震荡法
拍照语音搜题，微信中搜索"皮皮学"使用
参考答案：
参考解析：
知识点：
皮皮学刷刷变学霸
举一反三
【简答题】设一平面经过点P(2，-1，-4)和x轴，求此平面的方程．
【简答题】点P（0，-1，-1）到平面2x+y-2z+2=0的距离为_____________.
【单选题】Please indicate the main function of the phrase that is in boldface in the following passage. More than one letter might be acceptable, but you must choose only one option as the best. Consider these ...
A.
P = a premise marker
B.
C = a conclusion marker
C.
A = an assuring term
D.
G = a guarding term
E.
D = a discounting term
F.
E+ = a positive evaluative term
G.
E- = a negative evaluative term
H.
N = none of the above
【单选题】Please indicate the main function of the phrase that is in boldface in the following passage. More than one letter might be acceptable, but you must choose only one option as the best. Consider these ...
A.
P = a premise marker
B.
C = a conclusion marker
C.
A = an assuring term
D.
G = a guarding term
E.
D = a discounting term
F.
E+ = a positive evaluative term
G.
E- = a negative evaluative term
H.
N = none of the above
【简答题】过点P（0，-1）作圆C：x 2 +y 2 -2x-4y+4=0的切线 （1）求点P到切点A的距离|PA|； （2）求切线的方程．
【简答题】求曲面x 2 +2y 2 +2z 2 =5在点(1，1，1)处的切平面与法线方程．
【单选题】【机电-机械】当发现眼睛可能进了粉屑,应采取措施:
A.
坚持实习,下班后上医院
B.
先告诉指导教师,尽快上医院检查
C.
坚持实习,不是特别难受就不上医院
D.
立刻上医院进行检查
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