Abstract—In order to verify the performance of lunar lander structure, landing-impact test is urgently needed. And the test equipment is necessary for the test. The functions and the key points of the equipment are presented to satisfy the requirements of the test, and the design scheme is proposed. The composition, the major function and the critical parts’ design of the equipment are introduc...

Excessive use of chemical fertilizers in the soil will cause excessive residues heavy metals, hardening and high alkalinity. A pH tester is generally used to test scale ensure normal growth crops. However, cannot be directly case should moistened before measurement. In addition, existing testers can only perform single-point tests, multiple tests are required order obtain accurate experimental ...