班氏丝虫病的早期临床表现特征是()
A.丝虫热
B.精囊炎、睾丸炎和附睾炎
C.肺炎
D.周期性发作的淋巴管炎和淋巴结炎
E.乳糜尿
参考答案:D
反映压缩机行程容积利用程度和性能优劣的是()
A.最大压力比
B.温度系数
C.排气系数
D.容积系数
The standing part of a tackle is().
A.all the fall except the hauling part
B.the hook that engages the weight to be moved
C.that part to which power is applied
D.that part of the falls made fast to one of the blocks