具有中枢性肌肉松弛作用的成分是()
A.厚朴酚
B.β-桉叶醇
C.厚朴碱
D.苍术酮
E.丁香油酚
参考答案:A
In front of the reading room of Yangzhou High School, a notice reads, “When you finish the book, please ________ it on the shelf.”
A.replace
B.twist
C.reform
D.pin
采用开放式、半开放式高温作业,利用自然通风,应尽量()对热源隔离。
A.在夏季主导风向的上风侧
B.在夏季主导风向的下风侧
C.在冬季主导风向的上风侧
D.在冬季主导风向的下风侧