皮皮学，免费搜题
登录
logo - 刷刷题
搜题
【单选题】
下列选项不属于鱼类特有的主要特征是（　　）
A.
终生生活在水中
B.
用鳃呼吸
C.
身体背部脊椎骨组成的脊柱
D.
用鳍游泳
手机使用
分享
复制链接
新浪微博
分享QQ
微信扫一扫
微信内点击右上角“…”即可分享
反馈
参考答案：
举一反三
【判断题】下图中,15为线性折弯标注,左边的3.75为“折断高度因子1.5”乘以“文字高度2.5”得到的数值,具体操作是先进行线性标注15,再用标注面板的“标注,折弯标注”命令或标注菜单栏的“线性折弯”命令对15进行线性折弯。 中间的3.75为折断标注的“折断大小”值,具体的操作是先进行线性标注30,再用标注面板的“打断”命令或标注菜单栏的“标注打断”命令进行折断。 R20为半径折弯标注,具体的操作是利用“...
A.
正确
B.
错误
查看完整题目与答案
【单选题】使用打断命令将下图(1)中的外螺纹小径线断开成3/4个圆,如下图(2)所示,如果选择对象时的拾取点,不适合作为打断点时,可在命令执行过程中输入( ),重新定义第一个打断点的位置。
A.
字母C
B.
字母F
C.
字母Z
D.
字母A
查看完整题目与答案
【单选题】He missed his mother very much and ________ crying.
A.
can’t help
B.
couldn’t help to
C.
couldn’t help
D.
couldn’t to help
查看完整题目与答案
【单选题】gdb 中info b 命令的作用是()
A.
查看所有断点设置信息
B.
设置断点
C.
显示变量b的值
D.
打印变量
查看完整题目与答案
【单选题】She couldn't have entered the competition, but, for lack of confidence, she _______. [     ]
A.
couldn't
B.
didn't
C.
doesn't
D.
hadn't
查看完整题目与答案
【单选题】As the mountains were covered with a __________ of cloud, we couldn't see tbeir tops.
A.
coating
B.
film
C.
veil
D.
shade
查看完整题目与答案
【单选题】—Do you let your kids travel by themselves at night? —________! It couldn’t be more dangerous.
A.
Of course
B.
Not at all
C.
Absolutely not
D.
I’m not sure.
查看完整题目与答案
【单选题】Even after reading it for three lines，he couldn’t_____the meaning of that letter.
A.
conceive
B.
consult
C.
contrast
D.
concern
查看完整题目与答案
【简答题】用一个仪表测量某一物理量9次,得样本均值56.32,样本标准差0.22,该物理量真值的置信水平为0.99的置信区间____.
查看完整题目与答案
【简答题】A．She couldn't find a part-time job. B．She was expelled by the school. C．She couldn't continue her study. D．She refused to study at school.
查看完整题目与答案
相关题目：
【判断题】下图中,15为线性折弯标注,左边的3.75为“折断高度因子1.5”乘以“文字高度2.5”得到的数值,具体操作是先进行线性标注15,再用标注面板的“标注,折弯标注”命令或标注菜单栏的“线性折弯”命令对15进行线性折弯。 中间的3.75为折断标注的“折断大小”值,具体的操作是先进行线性标注30,再用标注面板的“打断”命令或标注菜单栏的“标注打断”命令进行折断。 R20为半径折弯标注,具体的操作是利用“...
A.
正确
B.
错误
查看完整题目与答案
【单选题】使用打断命令将下图(1)中的外螺纹小径线断开成3/4个圆,如下图(2)所示,如果选择对象时的拾取点,不适合作为打断点时,可在命令执行过程中输入( ),重新定义第一个打断点的位置。
A.
字母C
B.
字母F
C.
字母Z
D.
字母A
查看完整题目与答案
【单选题】He missed his mother very much and ________ crying.
A.
can’t help
B.
couldn’t help to
C.
couldn’t help
D.
couldn’t to help
查看完整题目与答案
【单选题】gdb 中info b 命令的作用是()
A.
查看所有断点设置信息
B.
设置断点
C.
显示变量b的值
D.
打印变量
查看完整题目与答案
【单选题】She couldn't have entered the competition, but, for lack of confidence, she _______. [     ]
A.
couldn't
B.
didn't
C.
doesn't
D.
hadn't
查看完整题目与答案
【单选题】As the mountains were covered with a __________ of cloud, we couldn't see tbeir tops.
A.
coating
B.
film
C.
veil
D.
shade
查看完整题目与答案
【单选题】—Do you let your kids travel by themselves at night? —________! It couldn’t be more dangerous.
A.
Of course
B.
Not at all
C.
Absolutely not
D.
I’m not sure.
查看完整题目与答案
【单选题】Even after reading it for three lines，he couldn’t_____the meaning of that letter.
A.
conceive
B.
consult
C.
contrast
D.
concern
查看完整题目与答案
【简答题】用一个仪表测量某一物理量9次,得样本均值56.32,样本标准差0.22,该物理量真值的置信水平为0.99的置信区间____.
查看完整题目与答案
【简答题】A．She couldn't find a part-time job. B．She was expelled by the school. C．She couldn't continue her study. D．She refused to study at school.
查看完整题目与答案
参考解析：
知识点：
题目纠错 0
发布
创建自己的小题库 - 刷刷题