HSK属于（）考试。
A、成绩测试
B、水平测试
C、诊断测试
D、潜能测试
砂的粒径范围为（）mm。
A、0.10～4.70
B、0.15～4.75
C、0.20～4.80
D、0.25～4.85
跳频分集增益实际值与无线环境等有关，一般可以认为有（）db的增益。
A、2
B、5
C、10
D、12
A class games.cards.Poker is correctly defined in the jar file Poker.jar. A user wants to execute the main method of Poker on a UNIX system using the command：java games.cards. Poker What allows the user to do this？（）
A、put Poker.jar in directory /stuff/java， and set the CLASSPATH to include /stuff/java
B、put Poker.jar in directory /stuff/java， and set the CLASSPATH to include /stuff/java/*.jar
C、put Poker.jar in directory /stuff/java， and set the CLASSPATH to include /stuff/java/Poker.jar
D、put Poker.jar in directory /stuff/java/games/cards， and set the CLASSPATH to include /stuff/java
设函数f（x）在区间［a，b］上连续，则下列结论中哪个不正确？（）