更多"[单选题]Window Heat Computers provides"的相关试题:
[单选题]【单选】WINDOW HEAT窗加温电门，至少在起飞前___分钟将电门置于ON位。
A.5
B.10
C.15
D.20
[单选题]Pitot heating:
A. Operates at a low level on ground, changeover to normal power in flight
B. Only operates in flight
C. When above 80kt on ground
[单选题]Electrical heating protects:
A. Pitot heads and Angle-Of-Attack probes (AOAs)
B. Pitot heads and Total Air Temperature (TAT) probes
C. Pitot heads, Static ports, Total Air Temperature (TAT) probes, Angle-Of-Attack probes (AOAs)
[判断题]在电场中某点分别放置电量为Po、2Po、3Po的检验电荷，该点的场强就会变化，移去检验电荷，该点的场强变为零。( )
A.正确
B.错误
[单选题]When did TAT heating?
A. In flight, not on ground
B. On ground, not in flight
C. Only on ice condition
[单选题]Hot air heating protects which critical areas of the aircraft?
A. Three outboard leading-edge slats of each wing
B. Engine air intakes
C. Both correct
[单选题]有一磷酸盐溶液，可能由Na3PO4、Na2HPO4、NaH2PO4或其中二者的混合物组成，今以百里酚酞为指示剂，用盐酸标准滴定溶液滴定至终点时消耗V1mL，再加入甲基红指示剂，继续用盐酸标准滴定溶液滴定至终点时又消耗V2mL。当V2＞V1，V1＞0时，溶液的组成为（）。
A.Na2HPO4＋NaH2PO4
B.Na3PO4＋Na2HPO4
C.Na2HPO4
D.Na3PO4＋NaH2PO4
[单选题]NaOH滴定H3PO4以酚酞为指示剂，终点时生成（）。（已知H3PO4的各级离解常数：Ka1=6.9×10-3，Ka2=6.2×10-8，Ka3=4.8×10-13）
A.NaH2PO4
B.Na2HPO4
C.Na3PO4
D.NaH2PO4+Na2HPO4
[单选题]15、 NaOH滴定H3PO4以酚酞为指示剂，终点时生成 （ ）（H3PO4：Ka1=6.9310-3 Ka2=6.2310-8 Ka3=4.8310-13 ）
A.A、NaH2PO4
B.B、Na2HPO4
C.C、Na3PO4
D.D、NaH2PO4 + Na2HPO4
[单选题]已知H3PO4的pKa1，pKa2，pKa3分别为2.12，7.20，12.36，则PO43-的pKb为（）。
A.11.88
B.6.8
C.1.64
D.2.12
[简答题] We must take some measures to control the pollution.
[单选题]医嘱西地兰1片,PO,sos此属
A.长期医嘱
B.临时医嘱
C.长期备用医嘱
D.立即执行医嘱
E.临时备用医嘱
[单选题]H2PO4–的共轭碱是（）。
A.HPO42–
B.PO43–
C.H3PO4
D.OH-
[判断题] Keep Away From Heat(远离热源)标签是危险性标签。
A.正确
B.错误
[简答题] Please move your chair to the window
[简答题] I am wondering who broke the window
[填空题]汽轮机积盐中,Na3PO4常沉积在( )。
[单选题]水汽系统中加药Na3PO4可以用来调节炉水的（ ）。
A.A.电导率
B.B.PH
C.C.介质纯度
D.D.以上三者均可
