1_____education is the instruction that occurs when the instructor and students are separated by distance or time,or both

某航班的航程为A—B—C.。已知各航段的实际业载重量为：A—B1439公斤；A—C.1317公斤。A站的最大可用业载为4491公斤，B站的最大可用业载为4061公斤，则B站的实际可装业载为_______公斤。

电梯作业人员必须持()操作证上岗。

TKJ1500/1。75-JXW的意思是_载重量为_公斤额定速度为_米/秒的微机集选控制的交流客梯

If a boy or a girl has grown up in a home with sharing tasks and decisions，he or she will probably______.

某线段长度为300m，相对误差为1/1500，则该线段中误差为______。

通常我们称__的电梯为低速电梯；速度为__的电梯为快速电梯；速度为__的电梯为高速电梯；速度为__的电梯为超高速电梯。

通常我们称_M/S的电梯为低速电梯；速度为_M/S的电梯为快速电梯；速度为_M/S的电梯为高速电梯；速度为_M/S的电梯为超高速电梯。

Duty is an act or a course of action that people __________you to take by social customs, law or religion.

Duty is an act or a course of action that people ______you to take by social customs, law or religion.

Project ______is an uncertain event or condition that，if it occurs，has a positive or a negative effect on at least one project objective，such as time，cost，scope，or quality．

It will be a relief over the death of a friend or a relative if the friend or relative dies from ______.