Which of the following operating features do displacement pumps bear if they are working under no-cavitation condition?（） (1) output is almost directly proportional to speed (2) they are self-priming (3) they will develop a discharged pressure equal to the resistance to be overcome, irrespective of speed<br>A:（1）and（2）<br>B:（2）and（3）<br>C:（1）and（3）<br>D:（1），（2）and（3）

Which of the following operating features do displacement pumps bear if they are working under no-cavitation condition?（） (1) output is almost directly proportional to speed (2) they are self-priming (3) they will develop a discharged pressure equal to the resistance to be overcome, irrespective of speed
A:（1）and（2）
B:（2）and（3）
C:（1）and（3）
D:（1），（2）and（3）

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