生产性有害因素必须具备哪些条件,才能引起职业性损害?
参考答案:
第一,有害因素作用的强度和剂量。第二,接触的机会和程度,第三,个体因素的作用。第四,联合作用。
Her many talents were ___________all her friends.
A.envy among
B.the envy of
C.the envy at
D.envy it
We are at your service. Don’t _____to turn to us if you have any further problems.
A.beg
B.hesitate
C.desire
D.seek