租赁期限不得超过( )年。
A．5
B．10
C．15
D．20
参考答案：D
解析：租赁期限不得超过20年。超过20年的，超过部分无效。
用词的适当形式填空。
1. Thank you for______ (help) me.
2. Thanks for your ______(invite).
3. Zhang Ming ______(have) to stay at at home to look after his brother because his mother isn't at home.
激光焊可一次穿透( )以下的金属材料或焊接微型件。
A．10mm
B．15mm
C．20mm
D．30mm
