皮皮学，免费搜题
登录
搜题
【单选题】
下列关于原子结构的说法中，错误的是（　　）
A.
核电荷数一定等于质子数
B.
质子数一定不等于中子数
C.
相对原子质量约等于质子数和中子数之和
D.
一般来说，原子是由质子、中子、电子构成
拍照语音搜题，微信中搜索"皮皮学"使用
参考答案：
参考解析：
知识点：
.
..
皮皮学刷刷变学霸
举一反三
【判断题】一般地,变频器是不允许在高速运行情况下马上转入直流制动的。
A.
正确
B.
错误
查看完整题目与答案
【单选题】—Would you like to fish with me ? —I’m afraid I have no time . [      ]
A.
am free
B.
am no free
C.
am not free
D.
have no free
查看完整题目与答案
【单选题】I’d like ( ) your invitation, but I’m afraid I’m not free this weekend.
A.
to accept
B.
acceptting
查看完整题目与答案
【判断题】一般地，变频器是不允许在高速运行情况下马上转入直流制动的。
A.
正确
B.
错误
查看完整题目与答案
【单选题】机构具有确定运动的条件是原动构件数（）机构的自由度数。
A.
多于
B.
等于
C.
少于
查看完整题目与答案
【单选题】Sorry,I'm not free this evening.()dinner with Mike.
A.
I will have
B.
I'm having
C.
I have
查看完整题目与答案
【单选题】--- Are you free today, Mrs Green? --- I’m free every day ______ today.
A.
besides
B.
except
C.
but
D.
or
查看完整题目与答案
【单选题】If I _______ next week, I _______ the film with you. Actually, I can’t wait for that.
A.
have free; will see
B.
will be free; will see
C.
have free time; see
D.
am free; will see
查看完整题目与答案
【单选题】— _______ you _______ free tomorrow? — No. I _______ free the day after tomorrow. [     ]
A.
Are; going to; will
B.
Are; going to be; will
C.
Are; going to; will be
D.
Are; going to be; will be
查看完整题目与答案
【单选题】How can I get legal advice for free?()
A.
You can get nothing for free.
B.
To be frank, I don't know for sure.
C.
You can go to a law firm and ask about that.
查看完整题目与答案
相关题目：
【判断题】一般地,变频器是不允许在高速运行情况下马上转入直流制动的。
A.
正确
B.
错误
查看完整题目与答案
【单选题】—Would you like to fish with me ? —I’m afraid I have no time . [      ]
A.
am free
B.
am no free
C.
am not free
D.
have no free
查看完整题目与答案
【单选题】I’d like ( ) your invitation, but I’m afraid I’m not free this weekend.
A.
to accept
B.
acceptting
查看完整题目与答案
【判断题】一般地，变频器是不允许在高速运行情况下马上转入直流制动的。
A.
正确
B.
错误
查看完整题目与答案
【单选题】机构具有确定运动的条件是原动构件数（）机构的自由度数。
A.
多于
B.
等于
C.
少于
查看完整题目与答案
【单选题】Sorry,I'm not free this evening.()dinner with Mike.
A.
I will have
B.
I'm having
C.
I have
查看完整题目与答案
【单选题】--- Are you free today, Mrs Green? --- I’m free every day ______ today.
A.
besides
B.
except
C.
but
D.
or
查看完整题目与答案
【单选题】If I _______ next week, I _______ the film with you. Actually, I can’t wait for that.
A.
have free; will see
B.
will be free; will see
C.
have free time; see
D.
am free; will see
查看完整题目与答案
【单选题】— _______ you _______ free tomorrow? — No. I _______ free the day after tomorrow. [     ]
A.
Are; going to; will
B.
Are; going to be; will
C.
Are; going to; will be
D.
Are; going to be; will be
查看完整题目与答案
【单选题】How can I get legal advice for free?()
A.
You can get nothing for free.
B.
To be frank, I don't know for sure.
C.
You can go to a law firm and ask about that.
查看完整题目与答案