The opening and closing valve is disposed swingably in {TAIL ~ the second intake air passage} so as to open and close {HEAD ~ the second intake air passage} 
The opening and closing valve is disposed swingably in { TAIL ~ the second intake air passage } so as to open and close { HEAD ~ the second intake air passage }
OTH OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD