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【单选题】
Probenecid can increase the efficacy of penicillin, because
A.
They have synergic bactericidal mechanisms
B.
Probenecid can promote metabolism of penicilli
C.
Probenecid can promote the absorption of penicilli
D.
Probenecid can inhibit penicillinase
E.
Probenecid competes with penicillin for excretion in the renal tubules
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【单选题】In acidic urine，weak acid drugs
A.
More dissociation, more resorption and slower excretion
B.
Less dissociation, more resorption and slow excretion
C.
Less dissociation, less resorption and faster excretion
D.
More dissociation, less resorption and faster excretion
E.
Less dissociation, more resorption and faster excretion
【多选题】Water pollution caused by anthropogenic sources include _________. ( )
A.
discharge of poorly-treated or untreated sewage
B.
runoff from construction sites
C.
acid rain caused by the industrial discharge of sulfur dioxide
D.
acid rain caused by volcanic discharges
【单选题】Alkalization of urine by giving bicarbonate is used to treat patients presenting with pheobaarbital(weak acid) overdose. Which of the following best describes the rationale for alkalization of urine i...
A.
To reduce tubular reabsorption of phenobarbital.
B.
To reduce ionization of phenobarbital.
C.
To increase glomerular filtration of phenobarbital.
D.
To increase proximal tubular secretion
E.
To increase tubular reabsorption of phenobarbital.
【多选题】Point-source pollution_________. ()
A.
affects the nearby area around the source
B.
are relatively easier to control
C.
is difficult to control
D.
affects far away places
【多选题】The chemicals pollutants in water include _________. ()
A.
crude oil and various petroleum products
B.
fertilizers,
C.
chlorinated solvents
D.
organic solvents
【多选题】Water pollutants can be divided into _________. ()
A.
chemical pollutants
B.
biological pollutants
C.
radiological pollutants
D.
physical pollutants
【多选题】The biological pollutants include _________. ()
A.
various microorganisms
B.
viruses
C.
worms
D.
algae
【单选题】Which pair of English phonemes differs in the manner of articulation?______
A.
/d/ and /n/
B.
/k/ and /t/
C.
/s/ and /z/
D.
/t/ and /b/