grep 'line.*empty' 会匹配下列哪些行？
A: this line is empty
B: this line empty
C: this line.empty
D: this lineempty
A: this line is empty
B: this line empty
C: this line.empty
D: this lineempty
举一反三
- The glass is full. (写出同义句） The glass is ________. A: not empty B: not full C: no empty D: no full
- 给定下面的代码片段： 哪些行会导致错误？ （） A: line 1 B: line 2 C: line 5 D: line 8
- $a = null;$b = 0;$c = "";var_dump(empty($a));//输出（）var_dump(empty($b));//输出（）var_dump(empty($c));//输出（）var_dump(isset($a));//输出（）var_dump(isset($b));//输出（）var_dump(isset($c));
- 中国大学MOOC: There are 10 syllables in a line and they follow a regular pattern: an unstressed syllable followed by a stressed one. This line is called a(an) _______ line.
- It is impolite to call elderly people by their first names in the U.S. A: True B: False C: Empty c D: Empty d