皮皮学，免费搜题
登录
搜题
【多选题】
关于变量和常量说法错误的是()A.
变量使用前不需要先定义；
B.
变量是指在程序运行期间，值可以改变的；
C.
常量是指在程序运行期间，值不可以改变；
D.
常量使用前不需要先定义；
拍照语音搜题，微信中搜索"皮皮学"使用
参考答案：
参考解析：
知识点：
皮皮学刷刷变学霸
举一反三
【简答题】B There is an English saying: “laughter is best medicine.” Until recently, few people took the saying seriously. Now however, doctors have begun to look into laughter and the effects it has on the hum...
【简答题】There is an English saying, “Laughter is the best medicine.” Until recently, few people took the saying seriously. Now however, doctors have begun to look into laughter and the effects it has on the h...
【单选题】Passage 3 (79) There is an English saying: 'Laughter is best medicine,' Until recently, few people took the saying seriously. Now, however, doctors have begun to look into laughter and the effects it ...
A.
smiling does good to health
B.
laughter can be tolerated
C.
there is a way to reduce pain
D.
laughter can work the muscles in the feet
【简答题】There is an English saying :“laughter is best medicine .”Until recently ,few people took the saying seriously .Now however ,doctors have begun to look into laughter and the effects it has on the human...
【简答题】There is an English saying that “Laughter is the best medicine.” Until recently, few people took the saying seriously. Now however, doctors have begun to look into laughter and the effects it has on t...
相关题目：