Four kinds of methods to synthesize o-Dichlorobenzaldehyde were introduced. the advantages of hydrolysis methods to reduce p-toluene sulfonyl chloride were discussed.
Purpose To evaluate the feasibility and superiority of the catarct ultrasonic emulsification, artificial lens implantation united micro trabecula resection adopt surface anesthescia.
This method can avoid the repetition and pretermission of integrating interval (or summarizing interval), especially in the convolution computation of multi-partition function.
Second, the author mainly describes the refulgence foretime during the development of the enterprise-owned school and the superiority compared with government -owned school.
The study reveals that the new artificial duramater has a much more practical advantage over the autogenous membrane in the reparation of the injured duramater.
The brachia-bridge crane has obvious superiority with high efficiency, large working range and low cost which are the advantages of both bridge crane and brachia crane.
It is found that the rational located destressing boreholes can induce structural failure of the surrounding rock-mass,consequently the high stress move deeply in the rock-mass,and the stres...
80. to reconquer it, but on the basis of the gigantic control of nature now achieved by man and of the free association now made possible, will be the task of the next generations.