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【多选题】
品种混杂退化原因有( )。A.
机械混杂
B.
生物学混杂
C.
品种本身变异
D.
不正确的选择
E.
不良环境和栽培条件
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举一反三
【单选题】阅读以下程序 #include＜iostream.h＞ void main( ) { char line[10] cin＞＞line cout＜＜line＜＜endl } 如运行时输入This is example.＜CR＞，则程序的输出结果是
A.
This
B.
This is
C.
This is a
D.
This is an example.
【单选题】When the static port being blocked, the indication of the VSI will ( )
A.
be frozen to the altitude at the moment of being blocked
B.
turn back to zero after a while
C.
be higher than actual speed
D.
be lower than actual speed
【多选题】You plan to use static database registration for a new listener when you create it.What could be the two reasons for this？（）
A.
More than one database is to be registered with the listener.
B.
The users will connect the database by using the host naming method.
C.
The Oracle Enterprise Manager is to be used to monitor an Oracle9i database.
D.
The database that is to be registered with the listener is configured in shared server mode.
E.
The listener is not configured on the default port of 1521 and the instance is not configured to register with a nondefault port.
【多选题】下列关于蜗杆传动的特点描述正确的是 。
A.
传动比大
B.
传动平稳、噪声低
C.
具有自锁性
D.
效率高
E.
效率低
F.
发热量大、容易磨损
G.
发热较小，不易磨损
【单选题】阅读以下程序 #includc＜iostream.h＞ vold main() { Char line[10]; cin＞＞line; cout＜＜line＜＜endl; } 如运行时输入This is example.＜CR＞，则程序的输出结果是
A.
This
B.
This is
C.
This is a
D.
This is an example．
【简答题】阅读程序，填空补充程序。 define【 】30 main() {【 】; num=10; total=num*PRICE; printf('total=%d,num=%d/n',【 】); }
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