皮皮学，免费搜题
登录
搜题
【单选题】
下列原子轨道的 n 相同,且各有 1 个自旋方向相反的不成对电子,则 x 轴方向可形成 π 键的是 ( )A.
p x - p x
B.
p x - p y
C.
p y - p z
D.
p z - p z
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
【单选题】When they got there,they found the people suffering the storm were __________ food and water supplies. [ ]
A.
in want of
B.
in praise of
C.
in honour of
D.
in place of
【单选题】What were the roles of women and men after WWII?
A.
Women were employed in factories and farms and men joined the war.
B.
Both women and men joined the war effort.
C.
Both women and men were employed in factories and farms.
D.
Men were employed in factories and farms and women returned to the homes in roles as wives and mothers.
【单选题】设计合同履行过程中，如果发包人根据工程的实际需要确需修改建设工程勘察、设计文件时，应当首先（ ）。
A.
经设计人批准
B.
报经原审批机关批准
C.
报有关部门审批
D.
由上一级勘察、设计单位修改
【单选题】以操作人员的操作位置所在的平面为基准，机械加工设备凡高度在( )m之内的所有传动机构的可动零、部件及其危险部位，都必须设置防护装置。
A.
2
B.
2．5
C.
3
D.
3．5
相关题目：