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多选题
“NN地V”结构中NN状语在语义上具有（）特点。
A
突举性
B
动态性
C
累积性
D
客观性
E
可宾性
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Which statement adds a constraint that ensures the CUSTOMER_NAME column of the CUSTOMERS table holds a value?()
A. ALTER TABLE customers ADD CONSTRAINT cust_name_nn CHECK customer_name IS NOT NULL;B. ALTER TABLE customers MODIFY CONSTRAINT cust_name_nn CHECK customer_name IS NOT NULL;C. ALTER TABLE customers MODIFY customer_name CONSTRAINT cust_name_nn NOT NULL;D. ALTER TABLE customers MODIFY customer_name CONSTRAINT cust_name_nn IS NOT NULL;E. ALTER TABLE customers MODIFY name CONSTRAINT cust_name_nn NOT NULL;F. ALTER TABLE customers ADD CONSTRAINT cust_name_nn CHECK customer_name NOT NULL;
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1B
2C
3D
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单选题Which statement adds a constraint that ensures the CUSTOMER_NAME column of the CUSTOMERS table holds a value?（）A
ALTER TABLE customers ADD CONSTRAINT cust_name_nn CHECK customer_name IS NOT NULL;B
ALTER TABLE customers MODIFY CONSTRAINT cust_name_nn CHECK customer_name IS NOT NULL;C
ALTER TABLE customers MODIFY customer_name CONSTRAINT cust_name_nn NOT NULL;D
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单选题有以下程序：#includemain(){ char *s=120119110; int n0,n1,n2,nn,i; n0=n1=n2=nn=i=0; do { switch(s[i++]) { default:nn++; case '0':n0++; case '1':n1++; case '2':n2++; } }while(s[i]); printf(n0=%d,n1=%d,n2=%d,nn=%d,n0,n1,n2,nn);}程序的运行结果是（ ）。A
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（－1）n2nn！/3nC
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2nn！/3n
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