<nobr id="3rskc"><sub id="3rskc"></sub></nobr>
<small id="3rskc"><small id="3rskc"></small></small><nobr id="3rskc"><noframes id="3rskc"><center id="3rskc"></center>
<pre id="3rskc"><small id="3rskc"><nobr id="3rskc"></nobr></small></pre><thead id="3rskc"><sup id="3rskc"></sup></thead><input id="3rskc"><ul id="3rskc"><thead id="3rskc"></thead></ul></input>
  • <nobr id="3rskc"><noframes id="3rskc">
  • 




    
    
    
        
    
    
    
    
        
    
            
    
                
                
    
                    
                        
    
                                
    
                                    單項(xiàng)選擇題
                                    
    襯里管道應(yīng)采用軟質(zhì)或半硬質(zhì)墊片。安裝時(shí)墊片應(yīng)放正，必要時(shí)可用（）找正。
    
                                
    
                                
                                    
    
	A.硬質(zhì)墊
    
	B.金屬墊
    
	C.斜墊
    

    
                                
                                
                                
    
                                    
                                    
                                
    
                                

                        
    
                    
                
    

                
                    
                    

            
    
            
    
                
            
    
        
    
    
    
    

    

    
    
    
        
    
            
    
                
                
    

                
    
            
    
        
    
    
    

    

    
    
    
        
        
        微信掃碼免費(fèi)搜題