notice observe discover 区别?

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• 求英语作文一片 ==Directions:Write a notice within 80 words according to the given business situation.Write the notice on the Answer Sheet.You,Liu Ming,as a safety officer,learned from a report that an accident took place last week.A worker,without necessary protective clothing,fell asleep while running the machine.The high temperature burned him severely.You are to write a notice to remind employees to observe the safety regulations.It is very urgent.
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• 1.常说的“四看”,“三使役”,“两听”,“一感觉”中的“四看”是___A.see watch observe look atB.see watch observe notice2.hardly,scarcely,___when是“刚要...就的意思”=no sooner thanA.rarelyB.barely谢绝似是而非的答案,
• 1.disturb,interrupt,disrupt的区别2.disperse,dissipate,dispel的区别3.diversion,amusement,entertainment的区别4.distrust,doubt,suspect的区别5.border,boundary,compass的区别6.resolve,solve的区别7.assess,estimate的区别8.discard,abandon的区别9.discover,discern的区别10.dash,crash的区别
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• 关于x的一元二次方程mx2-（3m-1）x+2m-1=0，其根的判别式的值为1，求m的值及该方程的解．
• 当4-（3m-1）^有最大值时,求方程3m+1=4x-2的解.