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【判断题】
生态系统是封闭的系统
A.
正确
B.
错误
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参考解析：
知识点：
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举一反三
【单选题】——What’s your mother? ——She_________ a teacher, but now she is a doctor.
A.
used to be
B.
was used to
C.
use to be
D.
is used to be
查看完整题目与答案
【单选题】-Peter, what’s your mother doing now? -She ____________in the kitchen.
A.
cooks
B.
is cooking
C.
will cook
D.
Cooked
查看完整题目与答案
【单选题】---What’s your mother like? ---- .
A.
She likes reading
B.
She is outgoing
C.
She cooks well
D.
She looks after my father
查看完整题目与答案
【多选题】安装在车床主轴上的夹具,根据被加工工件定位基准和夹具的结构特点,可分为()等类型。
A.
以工件外圆为定位基面的卡盘和夹头式车床夹具，如自定心卡盘及各种定心夹紧卡头等
B.
以工件内孔为定位基面的心轴式车床夹具，如各种定位心轴（刚性心轴）和弹簧心轴等
C.
以工件顶尖孔定位的车床夹具，如顶尖和拨盘等
D.
以工件的不同组合表面定位的 角铁和花盘式夹具
查看完整题目与答案
【单选题】—Peter, what’s your mother doing now? —She____________in the kitchen.
A.
cooks
B.
is cooking
C.
will cook
D.
cooked
查看完整题目与答案
【单选题】What’s your mother?
A.
She is fine.
B.
She is a teacher.
C.
She is 40.
查看完整题目与答案
【判断题】运算器的主要功能是进行算术运算,不能进行逻辑运算。
A.
正确
B.
错误
查看完整题目与答案
【单选题】- What’s your mother doing now? - She the room.
A.
cleaned
B.
cleans
C.
has cleaned
D.
is cleaning
查看完整题目与答案
【单选题】下列属于要约的是( )
A.
征婚广告
B.
拍卖广告
C.
悬赏广告
D.
招标公告
查看完整题目与答案
【单选题】—What’s your mother__________ now？ —She’s __________ our house.
A.
doing, clean
B.
do; clean
C.
does; cleans
D.
doing; cleaning
查看完整题目与答案
相关题目：
【单选题】——What’s your mother? ——She_________ a teacher, but now she is a doctor.
A.
used to be
B.
was used to
C.
use to be
D.
is used to be
查看完整题目与答案
【单选题】-Peter, what’s your mother doing now? -She ____________in the kitchen.
A.
cooks
B.
is cooking
C.
will cook
D.
Cooked
查看完整题目与答案
【单选题】---What’s your mother like? ---- .
A.
She likes reading
B.
She is outgoing
C.
She cooks well
D.
She looks after my father
查看完整题目与答案
【多选题】安装在车床主轴上的夹具,根据被加工工件定位基准和夹具的结构特点,可分为()等类型。
A.
以工件外圆为定位基面的卡盘和夹头式车床夹具，如自定心卡盘及各种定心夹紧卡头等
B.
以工件内孔为定位基面的心轴式车床夹具，如各种定位心轴（刚性心轴）和弹簧心轴等
C.
以工件顶尖孔定位的车床夹具，如顶尖和拨盘等
D.
以工件的不同组合表面定位的 角铁和花盘式夹具
查看完整题目与答案
【单选题】—Peter, what’s your mother doing now? —She____________in the kitchen.
A.
cooks
B.
is cooking
C.
will cook
D.
cooked
查看完整题目与答案
【单选题】What’s your mother?
A.
She is fine.
B.
She is a teacher.
C.
She is 40.
查看完整题目与答案
【判断题】运算器的主要功能是进行算术运算,不能进行逻辑运算。
A.
正确
B.
错误
查看完整题目与答案
【单选题】- What’s your mother doing now? - She the room.
A.
cleaned
B.
cleans
C.
has cleaned
D.
is cleaning
查看完整题目与答案
【单选题】下列属于要约的是( )
A.
征婚广告
B.
拍卖广告
C.
悬赏广告
D.
招标公告
查看完整题目与答案
【单选题】—What’s your mother__________ now？ —She’s __________ our house.
A.
doing, clean
B.
do; clean
C.
does; cleans
D.
doing; cleaning
查看完整题目与答案