题目内容

How long has Dan stayed with Mr. Johnson?

A. Two years.
B. Two months.
C. Two weeks.

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How is Mrs. Johnson?

A. She is kind and helpful.
B. She is hopeful and careful.
C. She is thoughtful and useful.

Mrs. Johnson offers to _______.

A. call Dan’s parents
B. go to the airport with Dan
C. take care of Dan

When will Bill take Dan to the airport?

At 14:20.
B. In the morning.
C. In the afternoon.

关于应力，正确的说法是（）

A. 应力是单位面积上的内力集度
B. 一点处的应力既有大小，也有方向
C. 若截面上一点处的应力与截面上的平均应力大小相等，就能说明一点处的应力和平均应力是相同的。