... should less than 95%,monthly average level should less than 90% d. daily average vapour tension less than 2.2×10-3Mpa,monthly less than 1 ... .8×10-3MPae. elevation,<1000m f. Amplitude, The earthquake intensity does not exceed 8 degreesg. no water ... ,frost,condensation, or danger of flammability&explosion,no chamistry rusty or violent exercise ...