甲醇合成催化剂中铜基催化剂与锌铬催化剂比较正确的是()。
A、反应温度高
B、出塔甲醇含量高
C、副反应多
D、粗甲醇中杂质多
参考答案:D
A virtual memory system has five virtual pages numbered zero through four and three page frames. All the page frames are initially empty. How many page faults are generated with the following access sequence using a FIFO replacement policy0 1 2 3 0 1 4 0 1 2 3 4
A.8
B.9
C.10
D.11
客户终止网银代发代扣时,需提前()个银行工作日以书面形式通知经办行,经办行审核无误后提交分行审批并进行关闭操作。
A.1
B.3
C.5
D.7