旋毛虫病是通过其在肌肉中的包囊幼虫而在宿主间传播。感染途径主要是()。
A.呼吸道
B.消化道
C.皮肤
D.血液
参考答案:B
65. The Chinese people _____ brave and hard-working. The Chinese _____ a brave and hard-working people.
A.is; are
B.are; are
C.are; is
D.is; is
危险源辨识的第一个步骤是()。
A.划分作业活动
B.危险源辨识
C.风险评价
D.判断风险是否容许