题目内容
(请给出正确答案)
[主观题]
That is ().
A. the best film I've ever seen
B. a best film I've ever seen
C. the best film I've never seen
D. the best film I've always seen
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A. the best film I've ever seen
B. a best film I've ever seen
C. the best film I've never seen
D. the best film I've always seen
证明: (1)(A.▽)(uC)=(A.▽u)C (C为常矢); (2)(A.▽)B=(A.▽Bx)i+(A.▽By)j+(A.▽Bz)k.
A.A. to
B.B. with
C.C. for
A.A. study
B.B. studys
C.C. studies