1. Lub hauv paus ntsiab lus siab zoo;
2. Qhov kev xeem ntau yog xaiv tau;
3. Muab ob npaug rau kev sim rau o inhibition thiab o uas tsis yog-tshuaj;
4. Ntau hom kev sim rau kev kuaj rupture, creep test, thiab creep rau rupture test; cov txheej txheem xeem yog "ib qho tseem ceeb" ua haujlwm;
5. Tsis siv neeg txheeb cais;