5.5 Defining and Using Procedures
1 The RET instruction pops the top of the stack into the instruction pointer.
答 ：√
2 The USES operator lets you name all registers that are modified within a procedure.
答 ：√
3 In protected mode, each procedure call uses a minimum of 4 bytes of stack space.
答 ：√
4 The CALL instruction pushes the offset of the instruction following the CALL on the stack.
答 ：√
5 The ESI and EDI registers cannot be used when passing parameters to procedures.
答 ：×
6 The register list in the USES directive must use commas to separate the register names.
答 ：×
7 The USES operator only generates PUSH instructions, so you must code POP instructions yourself.
答 ：×
8 The PROC directive begins a procedure and the ENDP directive ends a procedure.
答 ：√
9 Nested procedure calls are not permitted by the Microsoft assembler unless the NESTED operator is used in the procedure definition.
答 ：×
10 It is possible to define a procedure inside an existing procedure.
答 ：×
11 The CALL instruction pushes the offset of the CALL instruction on the stack.
答 ：×
12 What would happen if the RET instruction was omitted from a procedure?
答 ：Execution would continue beyond the end of the procedure, possibly into the beginning of another procedure. This type of programming bug is often dificult to detect!