反应3X(g)+Y(g) 2Z(g)+2W(g)在2L密闭容器中进行,5min后

题型:选择题

问题:

反应3X(g)+Y(g) 2Z(g)+2W(g)在2L密闭容器中进行,5min后Y减少了0.5mol,则此反应的速率v为(      )

A.v(X)=0.05mol·L–1·min–1

B.v(Z)=0.10mol·L–1·min–1

C.v(Y)=0.10mol·L–1·min–1

D.v(W)=0.05mol·L–1·min–1

考点:化学反应速率的定义、公式
题型:选择题

溶媒的极性及化学反应物的荷电性对反应速度的影响

A.dC/dt=KS(Co-C)
B.pHm=1/2[pKw-1g(KOH-/KH+)]
C.1gK=lgK∞-KZAZB/∈
D.1gK=lgK0十1.02ZAZB(μ)1/2
E.lgC=lgCo-(Kt/2.303)

题型:选择题

女性,45岁,间歇性发作咽下困难3个月,可因情绪波动诱发。食管造影未见异常。

患者在等候检查时突然出现胸骨后剧烈疼痛,并放射到左肩,持续1小时,为了解病因,此时应立即做( )

A.胃镜

B.ECG

C.食管内pH及压力测定

D.静滴硝酸甘油

E.肌内注射阿托品止痛

题型:选择题

John Williams wants to purchase an apartment complex. The complex consists of 75 units each renting for $700 per month. The estimated vacancy and collection loss rate is 7 percent. The insurance for the building is $40000 annually and taxes are $22000 annually. Utilities are $18000 and the maintenance expense is $29000.

Assume a market cap rate of 11 percent. Recent sales of nearby apartment complexes have resulted in the following information.

Characteristics Units Slope Coefficient in $per Unit

Proximity to downtown In miles -350000

Vacancy rate Percentage - 50000

Building size Units + 75000

Williams’ proposed apartment complex is 4 miles away from downtown and has an estimated vacancy rate of 6 percent.

Using the income approach, the value of Williams’ apartment complex is:()

A. $5727273.

B. $4525455.

C. $4335455.

题型:选择题

联合收割机

题型:选择题

骨折抢救内容有()

A、呼吸、心跳骤停时要立即施行心肺复苏法

B、有大出血时,要先止血

C、开放性骨折时,局部要做清洁消毒处理,用纱布将伤口包好

D、为预防引起休克,适当应用止痛剂

E、骨头外露时要做清洁消毒处理,严禁送回组织内

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