热网加热器汽侧、水侧均装有安全阀，其动作值为正常值的（）倍。A.2 B.3 C.1.

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When a young man starts to earn his own living,he

can no longer expect others to pay his food,his clothes,                                 1.       

or his room,but he has to work till he wants to live                                       2.       

comfortable.If he spends most of his time playing                                         3.       

about in the way that he used to as a child,they will go                                  4.       

hungry.And if he breaks the laws of society that he used                                5.       

to break the laws of his parents,he may go to the prison.                                6.       

If,therefore,he works hard,keeps out of trouble and has                                 7.       

better health,he can have the great happiness of seeing                                   8.       

himself to make steady progress in his job and of                                          9.       

building up for himself his own position in society.                                       10.       

—What are their jobs?

—They are ______ workers.