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【单选题】
左心室肥大时,心电图上最重要的诊断指标是 :A.
额面心电轴-15°
B.
左心室高电压
C.
ST-T 继发性改变
D.
QRS 时限延长
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【简答题】Java的编译命令是 。
【简答题】网站推广的基本方法为( )，建立链接，发送电子邮件，发布新闻，提供免费服务，发布网络广告，使用传统的促销媒介。 A、 客户推荐和广告相结合 B、 电话宣传促销 C、 搜索引擎注册 D、 网络传销
【简答题】某一套管换热器的内管为Æ165mm ́4.5mm的钢管,内管中热流体被冷却,热流体流量为3000kg·h-1,比热容为1.87kJ·kg-1·K-1,进、出口温度分别为90°C、60°C,环隙中冷却水进出口温度分别为20°C和45°C,水的比热容为4.187kJ·kg-1·K-1,水侧对流传热系数为2200W×m-2×K-1,总传热系数K为1600 W·m-2·K-1(以外表面为基准)。试求:
【单选题】When securing a flash-type evaporator for an extended period of time, you should _____.
A.
fill the unit with saltwater
B.
fill the unit with de-scaling compound
C.
completely drain the unit
D.
tightly seal the unit to exclude air
【单选题】Which of the listed problems could produce a high absolute pressure within a flash type evaporator?
A.
production of high salinity distillate
B.
seawater feed temperature below 165℃
C.
a leak in the first stage demister
D.
a cracked distillate pump vent line
【单选题】passage four：questions 26～30 are based on the following passage. It came as something of a surprise when Diana, Princess of Wales, made a trip to Angola in 1997, to support the Red Cross’s campaign fo...
A.
to voice her support for a total ban of landmines
B.
to clarify the British government’s stand on landmines
C.
to investigate the sufferings of landmine victims there
D.
to establish her image as a friend of landmine victims
【单选题】It came as something of a surprise when Diana, Princess of Wales, made a trip to Angola in 1997 , to support the Red Cross's campaign for a total ban on all anti-personnel landmines (地雷) . Within hour...
A.
to voice her support for a total ban of landmines
B.
to clarify the British government's stand on landmines
C.
to investigate the sufferings of landmine victims there
D.
to establish her image as a friend of landmine victims
【单选题】It came as something of a surprise when Diana, Princess of Wales, made a trip to Angola in 1997, to support the Red Cross's campaign for a total ban on all anti-personnel landmines. Within hours of ar...
A.
to clarify the British government's stand on landmines
B.
to establish her image as a friend of landmine victims
C.
to investigate the sufferings of landmine victims there
D.
to voice her support for a total ban of landmines
【单选题】When a flash-type evaporator is to be secured for an extended period of time, the entire unit should be drained, cleaned, and _____.
A.
completely filled with saltwater
B.
filled with de-scaling compound
C.
tightly closed to exclude air
D.
vented to the atmosphere
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