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【单选题】
Acid rain ______.
A.
immediately kills trees and affects aquatic life in lakes and rivers
B.
deposits various metals iron, mercury, aluminum into the soil
C.
kills forests by weakening them and reduces fish populations
D.
releases sulfur dioxide, nitrogen oxide and into the atmosphere
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参考答案：
参考解析：
刷刷题刷刷变学霸
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【单选题】假设“教师”表中有C型字段“姓名”，要求将姓“李”的教师记录全部打上删除标记，可以使用SOL命令( )。
A.
DELETE FROM 教师 FOR 姓名="李"
B.
DELETE FROM 教师 WHERE 姓名="李%"
C.
DELETE FROM 教师 FOR 姓名="李#"
D.
DELETE FROM 教师 WHERE 姓名 LIKE"李%"
【单选题】Another natural ______ that contributes to the welfare of the country is water.
A.
source
B.
mineral
C.
power
D.
resource
【单选题】下列说法正确的是( )。
A.
Java中包的主要作用是实现跨平台功能
B.
package语句只能放在import语句后面
C.
包(package)由一组类(class)和界面(interface)组成
D.
可以用#include关键词来标明来自其他包中的类