题目内容

Those who most need help from community service are ________.

A. the old and the young
B. the old and the handicapped
C. the homeless and the friendless
D. old women

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If you want to lend a hand and need the necessary information, you may go to ________.

A. your school
B. a social service committee
C. the library and churches
D. any places of the above

In fact, you are able to do something for those who need help.

A. 对
B. 错

混凝土坝和浆砌石坝变形观测的项目主要有、、等。

变形观测的正负号规定中，对水平位移向___为正，向_为正；反之为负。对竖向位移，向_为正，向___为负。