LKJ的数字量输入通道光电隔离式50V输入通道数是（）路，110V输入通道数8路。

阅读然后判断对错，对的写T， 错的写F

Difficulties will appear at any time in our life. When times become difficult, remember a moment in your life that was filled with joy and happiness. Remember how made you feel, and you will have the strength (勇气)，you need to get through any trial(困境)。

When life throws you more difficulties than you think you can handle, remember something you can achieve by insisting(坚持) to the end.

In doing so, you’ll find you have the ability to overcome each obstacle(障碍) brought your way. When you find yourself drained and depleted of energy(筋疲力尽), remember to find a place of sanctuary(庇护) and rest.

Take the necessary time in your own life to dream your dreams and renew your energy, so you’ll be ready to face each new day. When you feel nervous, find something fun to do,. You’ll find that the stress you feel will dissipate and your thoughts will become clearer.

When you are faced with so many negative and draining situations, realize how minuscule(极小的) problems will seem when you view your life as a whole and remember the positive things.

小题1: Difficulties often appear in your life.

小题2: When life throws you more difficulties, you can give up your dream.

小题3: When you feel tired, you should find a place to rest.

小题4: The stress will be more when you face it happlily.

小题5: We should try to remember the good things.

可以作为单方程计量经济学模型解释变量的有以下几类变量（）。

A.外生经济变量

B.外生条件变量

C.外生政策变量

D.滞后被解释变量

E.内生变量

驾驶机动车在进出非机动车道时，最高速度不能超过多少？

A．30公里/小时

B．40公里/小时

C．50公里/小时

D．60公里/小时

世界上绝大多数国家均实行雇主与雇员分担缴费义务的做法，同时，政府亦给以财政支持，体现了养老保险公共性。

沥青碎石配合比设计的主要控制指标是空隙率和饱和度。( )