”You are requested to make us the most favorable offer, stating origin, packing, detailed specifications, quantity suppliable and the earliest time of shipment. ” This sentence violates the principles
A. courtesy
B. concise
C. formal
D. clear
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若[x]补=1.0101,[y]补=1,1010,采用阵列直接补码乘法运算,则阵列乘法器的输出为()
A. 0.1(1)(1)000010
B. 01.(1)(1)000010
C. 0.1(1)(1)00001
D. 01
设int a=3,b=4,c=5;表达式(a+b)>c&&b==c的值是()
A. 2
B. -1
C. 0
D. 1
下列字符串常量表示中,哪个是错误的()
A. “”yes”or”No””
B. “‘OK!'”
C. ”abcd”
D. “ABC\0”
下列关于拉普拉斯运算符、调和场和调和函数,说法错误的是()
A. 若 Δu=0,则u为调和函数
B. Δu=div(grad (u))
C. 调和场的散度和旋度都为0
D. 调和场是一个矢量场