Kos npe 1.7. Roundabout kev sib tshuam

Ua ntsia hauv n. n. rau 50-100 m, sab nraud n. p. - rau 150-300 m, lub cim yuav tuaj yeem teeb tsa ntawm qhov sib txawv, tab sis qhov kev deb tau raws li tau teev tseg hauv Table 8.1.1 "Qhov nrug ntawm cov khoom".

Nta:

Thaum mus txog qhov kev sib tshuam zoo li no, nws raug nquahu kom txo qhov ceev kom muaj kev nyab xeeb thiab ua raws li cov cai ntawm kev tsav tsheb hla kev sib tshuam.