题目内容

Hypertension occurs when systolic and diastolic blood pressure regularly rises above _ and _ millimeters of mercury, respectively.

A. 120; 80
B. 140; 90
C. 80; 60
D. 120; 90
E. 130; 80

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What condition describes the thickening of the arterial wall due to the decomposition of plaques of fatty material and inflammatory cells?

A. High blood pressure
B. Myocardial infarction
C. Atherosclerosis
D. Angioplasty
E. Hypertension

Dangerously-clogged blood vessels can be widened by a procedure called a(n) _____.

A. Sphygmomanometer
B. Angioplasty
C. Ablation
D. Transplant
E. Phlebotomy

在3m长的色谱柱上，测得某组分保留时间（tR）9.0 min，半峰宽0.25 min，死时间1.5min，柱出口用皂膜流量计测得载气体积流速40mL/min，固定相体积2.5mL。求有效塔板数（）

A. 14400
B. 4986
C. 900
D. 7180

在3m长的色谱柱上，测得某组分保留时间（tR）9.0 min，半峰宽0.25 min，死时间1.5min，柱出口用皂膜流量计测得载气体积流速40mL/min，固定相体积2.5mL。求有效塔板高度（）。

A. 3.33 mm
B. 0.50
C. 0.31 cm
D. 0.60 mm