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计算题：某地在200米处气温为19.9℃，在1300米处气温为7.8℃。试求200～1300米气层中干空气块的大气稳定度。

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训练婴儿自己开始刷牙的最佳时间是（）。

A. 半岁左右
B. 1岁左右
C. 一岁半左右
D. 3岁左右

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法兰连接用的密封垫圈，压力越大，垫圈越厚。

A. 正确
B. 错误

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The ADMIN_EMP table has columns EMPNO， ENAME， DEPTNO， and SAL. It has a materialized view EMP_MV with a materialized log and an ENAME_IDX index on the ENAME column. You need to perform an online table redefinition on the ADMIN_EMP table to move it from the TBS1 tablespace to the TBS2 tablespace in the same schema. What action is required for the dependent objects when you perform online redefinition on the table？（）

A. The materialized view should have a complete refresh performed after the online table redefinition is completed.
B. The materialized view should have a fast refresh performed after the online table redefinition is completed.
C. The materialized view，materialized log，and the index should be dropped and re-created after the online table redefinition is complete.
D. The materialized view and materialized log should be dropped and all constraints disabled and re-created after the online table redefinition is complete.

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保险公司因分立、合并需要解散，或者股东会、股东大会决议解散，或者公司章程规定的解散事由出现，经国务院保险监督管理机构批准后解散。（）

A. 正确
B. 错误

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