[答案]:对
[解析]:参见教材P303
17
[答案]:对
[解析]:参见教材P304
18
[答案]:错
[解析]:参见教材P304
19
[答案]:对
[解析]:参见教材P304
20
[答案]:错
[解析]:参见教材P304
21
[答案]:错
[解析]:参见教材P305
22
[答案]:对
[解析]:参见教材P305
23
[答案]:对
[解析]:参见教材P306
24
[答案]:对
[解析]:参见教材P306
25
[答案]:错
[解析]:参见教材P307
26
[答案]:错
[解析]:参见教材P307
27
[答案]:错
[解析]:参见教材P307
28
[答案]:对
[解析]:参见教材P308
29
[答案]:错
[解析]:参见教材P311
30
[答案]:对
[解析]:参见教材P311