为什么内齿轮绞车钢丝绳磨损不得超过原直径的10%?
参考答案:钢丝绳磨损超过原直径的10%后,钢丝绳破断拉力总和及安全系数各降低20%,无法保证其可靠运行,可能造成断绳跑车事故。
根据短文,选择正确的答案,并把字母编号写在括号里。
A young mother and her little girl get on a bus and sit down. The bus conductor comes to ask them to buy
the tickets. "I want one ticket to Children's Park." The conductor looks at the little girl and says to her, "How old
are you?" The girl answers, "Mother says I am four years old at home, but I'm two years old on the bus." The
young mother's face turns red, very red. Then she buys a half (一半) ticket.
1. Where do they go?[ ]
A. Home.
B. The park.
C. The bus.
2. How do they go there?[ ]
A. By train.
B. On foot.
C. By bus.
3. How old is the little girl?[ ]
A. 2.
B. 3.
C. 4.
4. Why is the mother's face red?[ ]
A. She feels hot.
B. She is angry.
C. She teaches her daughter (女儿) to tell a lie (谎言).
5. What's the meaning of "ticket"? (“ticket”意思是什么?)[ ]
A. 方便面
B. 车票
C. 饮料
以下各项中,说法正确的是( )。
A.暂准进出境货物的使用、管理不纳入海关稽查范围内
B.海关稽查是从海关对货物放行后三年内实施的
C.一般进口货物的使用、管理不纳入海关稽查范围内
D.海关稽查是针对所有进出口企业、单位的