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使用砂轮机有哪些安全要求？

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电气线路安全注意事项有哪些？

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起重机械的安全特点有哪6点？

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The bacterial cells grow in a process of _______?

A. Binary fission;
B. replication;
C. germination;
D. division

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Which statement about generation time of bacteria is not right?

A. The time required for a population of cells to double in number;
B. Most bacteria have a generation time of 20 minutes;
C. The generation time for tuberculosis is 18 minutes ;
D. It is the time required for a bacterial cell to grow and divide.

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