题目内容

LD50 /ED50 称为治疗指数，此值越小药物越安全。

A. 对
B. 错

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The original version called SEQUEL was designed by anresearch center in 1974 and 1975.

A. IBM
B. ISO
C. Intel
D. ANSI

SQL's commands make it easy for you to design and manage the informaton in your database.

A. long
B. short
C. simple
D. complicated

The most commonly used SQL commands are classified as language commands.

A. DML, DCL and LCD
B. DDL, LCD and DCL
C. DDL, DML and LCD
DDL, DML and DCL

Thecommand is the most commonly used command in SQL.

A. INSERT
B. SELECT
C. WHERE
D. CREATE