数字万用表使用完毕后关闭万用表，测量前，应先用交流、直流电压档，确定无电流后进行测量。
查看答案
What two statements are true regarding the recommendations received from the SQL Access Advisor？（）
A. It cannot generate recommendations that support multiple workload queries.
B. It can recommend partitioning on tables provided that the workloads have some predicates and joins on the columns of the NUMBER or DATE type.
C. It can recommend partitioning only on tables that have at least 10，000 rows.
D. It can recommend only B-tree indexes and not bitmap or function-based indexes.
松开起动按钮SB1，电动机不会停转，这种依靠接触器自身辅助触头而使线圈通电的现象，称（）。
玻璃量器检定时，称取一定体积的水后，以水的质量除以该温度下水的密度即可得出其真实容积。
A. 正确
B. 错误
A企业接受一批订单，在这个过程中，经济合同、收料单、成本计算单、出库单等都属于原始凭证。
A. 正确
B. 错误
微信支付 
支付宝支付