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A3型题女，40岁，下肢水肿，查体：心尖巨限局性舒张期隆隆杂音，肺部听诊正常肝大（-），腹水（-），双下肢水肿（+）及皮肤呈暗紫色，右侧重于左侧。月经期未检查尿。 该患者下肢水肿最可能的原因是（）
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A3型题男，35岁，有风心病和乙型肝炎病史，肝功能反复异常，近2个月来出现食欲减退，乏力，踝部水肿，右上腹痛伴腹部逐渐增大。 该患者腹部逐渐增大的原因为（）
个人独资企业在申请企业设立登记时明确以其家庭共有财产作为个人出资的，应当依法以( )对企业债务承担无限责任。
麻醉药品专用处方应由药剂科留存( )年备查
A Canadian researcher has discovered that sound travels (21) air more than one-half kilometer an hour slower than had been believed. The discovery has surprised many engineers and scientists who learned they had been (22) the wrong speed of sound for many years.The speed of sound in air had been (23) to be three-hundred-thirty-one-point-two-nine meters a second. But Doctor George Wong found, (24) accident, that the speed of sound is only three-hundred-thirty-one-point-one-three meters a second. That is a difference of about sixteen centimeters a second.Doctor Wong is a member of the National Research Council of Canada. He was studying ways to (25) exactly the sound created by microphones. One of his experiments (26) a number he could use to find the speed of sound. He was (27) to learn that the speed of sound was slower than scientists had thought.To explain the difference, Doctor Wong spent eighteen months (28) past test research on the speed of sound. He finally found the (29) of the difference. It was a mathematics mistake (30) in Nineteen-Forty-Two by physicist H-C Hardy.Doctor Wong’s (31) does not mean a big change for the science of sound. This is (32) Doctor Hardy and Doctor Wong measured the speed of sound for what is called" standard air".Standard air exists only (33) thought. It is a way for scientists to agree (34) the same speed of sound. (35) the air around us, standard air always has a temperature of zero degrees Celsius and the same atmospheric pressure (36) the air at sea level. Standard air always has same amounts of nitrogen, oxygen, carbon dioxide and (37) gases. And in standard air, the speed of sound does not change.The change in the new speed of sound is (38) small to affect the work of most sound scientists and engineers. But scientists say Doctor Wong’s discovery may (39) improve instruments (40) use the speed of sound to measure very short distances. 23().
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