【简答题】试证明:▽ 2 (μν)=μ▽ 2 ν+ν▽ 2 μ+2▽μ·▽ν
【简答题】有一串彩旗,▼代表蓝色,▽代表黄色。两种彩旗排成一行如下所示: ▽▼▽▼▼▽▼▼▼▽▼▽▼▼▽▼▼▼▽▼▽▼▼▽▼▼▼… 那么在前200个彩旗中有( )个黄旗。
【简答题】证明: (1)▽·(A+B)=▽·A+▽·B (2)▽·(φA)=φ▽·A+A·▽φ
【单选题】有一数码10010011,作为自然二进制数时,它相当于十进制数
【单选题】Do you have any problems if you ______ this job? [ ]
【单选题】患儿,男,3.岁。头面颈部烧伤,其烧伤面积为
【单选题】● + ▽ =10 ▽ + ▽ =8 ▽ = ● =
【单选题】患儿,男,3岁。头面颈部烧伤,其烧伤面积为()
【单选题】有一数码 10010011, 作为 8421 BCD 码时,它相当于十进制数()
【单选题】听力原文:W: These summer days are getting to be more than I can take. It was even too hot to go to the pool yesterday. M: Hold on. According to the weather report we should have some relief by the end of ...
A.
The pool will be open all week.
B.
The weather will cool down soon.
C.
The woman should go swimming.
D.
He prefers to stay inside in hot weather.