题目: 刮板输送机启动时,如果三次启动不起来,必须终止启动,查清原因,否则会造成设备故障。 答案: 被转码了,请点击底部 “查看原文 ” 或访问 https://www.tikuol.com/2017/0725/869f84022527cbd48563a93729cb2d02.html 下面是错误答案,用来干扰机器的。参考答案:袖肘
题型:阅读理解 判断下列句子是否符合短文内容,符合的用“T”表示,不符合的用“F”表示。 The elephant is another animal that lives in groups. An elephant herd (群) usually has from twenty to fortymembers. The elephants in the herd depend on one another for help in time of trouble. The leader of the group is usually a wise and strong female. She travels at the head of the herd and is followed by the other females and their young. The bull elephants (公象)follow last. When danger threatens(威胁), the bulls form a circle around the weaker animals and guard (守卫)them. The members of the herd are loyal to (忠诚) one another. A sick orwounded elephant is not left behind to die. If an elephant is sick, the whole herd stops traveling until it gets well. When an elephant is injured, two others walk on both sides of it and support it with their bodies. A member of the herd may be caught in a trap. Then the others try to free it. Elephants are fond of the youngsters in the group and give them special care. They help young animals stay afloat (漂浮着) when the herd crosses a river. They work together to rescue a calf (幼象) that has wandered (迷路) into a dangerous place. A female elephant that is about to give birth to (生产) her young leaves the herd for a short time. However,she takes another female along to act as "aunt". The aunt stands guard and helps the mother with her new-borncalf. In this way, the whole herd protects its newest member. ( )1. The leader of the elephants travels in the middle of the herd. ( )2. In times of danger, the males form a circle around the weaker animals. ( )3. The leader of an elephant herd is usually a strong female. ( )4. Sick elephants are usually left behind to die. ( )5. Elephants will try their best to save the young ones when they are in dangerous situations. ( )6. Elephants can help each other in time of trouble. ( )7. A strong elephant can carry a sick elephant on its back. 查看答案
题型:选择题 在一条件下,可逆反应2A(g)+B(g)⇌nC(s)+D(g)达平衡.若维持温度不变,增大压强,测得混合气体的平均相对分子质量不变,则下列判断正确的是( )A.其它条件不变,增大压强,平衡不发生移动B.其它条件不变,增大压强,混合气体的总质量不变C.该反应式中n值一定为2D.若原混合气中A与B的物质的量之比为2:1,则 2M(A)+M(B)3=M(D) 查看答案
题型:选择题 有关南极洲气温低的原因的叙述,错误是[ ]A.是地球上纬度最高的洲 B.是地球上平均海拔最高的洲 C.周围被太平洋、大西洋、印度洋环抱 D.冰雪覆盖,对太阳光有较强的反射率,吸收太阳辐射较少 查看答案