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【单选题】
放毒型草履虫必须具备：A.
k基因和卡巴粒
B.
k基因、不需卡巴粒
C.
K基因、不需卡巴粒
D.
K基因和卡巴粒
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反馈参考答案：
举一反三
【简答题】若直线l的方向向量为（4，2，m），平面α的法向量为（2，1，-1），且l⊥α，则m=______．
【单选题】What is the difference between velocity and speed?
A.
There is no difference.
B.
Velocity is a vector, and speed is a scalar.
C.
Speed is a vector, and velocity is a scalar.
D.
Speed states only a magnitude, and velocity states a magnitude and direction.
E.
Velocity states only a magnitude, and speed states a magnitude and direction.
【单选题】What is the difference between velocity and speed?
A.
There is no difference, they are both vectors.
B.
Speed is a scalar and velocity is a vector.
C.
Speed is a vector and velocity is a scalar.
D.
There is no difference, they are both scalars.
【简答题】已知l∥α,且l的方向向量为u=(2,m,1),平面α的法向量为v=(1, ,2),则m=____.
【简答题】若l的方向向量为（2，1，m），平面α的法向量为（1， 1 2 ，2），且l⊥α，则m=______．
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