据袁世凯对“二十一条”的朱批原件中,针对日本提出在内蒙古课税、开埠、合办工农业等要求,袁批:“办不到”;他还写道:“各条内多有干涉内政侵犯主权之处,实难同意。”但最终部分接受,签订《民四条约》。这反映出()。
A. 袁世凯具有强烈的民族意识
B. 日本妄图将中国完全殖民地化
C. 民国初年外交处境非常艰难
D. 北洋政府的对日政策日趋强硬
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THDS-A红外轴温探测系统中模拟信号调理板面板上的测试端子,Vzzw2是()。
在给定的显著性水平之下,若DW统计量的下和上临界值分别为dL和du,则当dL
A. 存在一阶正自相关
B. 存在一阶负相关
C. 不存在序列相关
D. 存在序列相关与否不能断定
在PowerPoint2003演示文稿中,另存为网页对话框中,不能够保存的格式有()
A. 单个网页
B. PowerPoint放映
C. PNG格式文件
D. Word文档格式
Examine the data in the EMPLOYEES table. EMPLOYEES EMP_NAME DEPT_ID MGR_ID JOB_ID SALARY EMPLOYEE_ID 101 Smith 20 120 SA_REP 4000 102 Martin 10 105 CLERK 2500 103 Chris 20 120 IT_ADMIN 4200 104 John 30 108 HR_CLERK 2500 105 Diana 30 108 IT_ADMIN 5000 106 Smith 40 110 AD.ASST 3000 108 Jennifer 30 110 HR_DIR 6500 110 Bob 40 EK_DIR 8000 120 Revi 20 110 SA_DIR 6500 On the EMPLOYEES table, EMPLOYEE_ID is the primary key. MGR_ID is the ID of managers and refers to the EMPLOYEE_ID. The JOB_ID column is a NOT NULL column. Evaluate this DELETE statement: DELETE employee_id, salary, job_id FROM employees WHERE dept_id = 90; Why does the DELETE statement fail when you execute it?()
A. There is no row with dept_id 90 in the EMPLOYEES table.
B. You cannot delete the JOB_ID column because it is a NOT NULL column.
C. You cannot specify column names in the DELETE clause of the DELETE statement.
D. You cannot delete the EMPLOYEE_ID column because it is the primary key of the table.